xref: /external/libxml2/xmlschemas.c

/*
 * schemas.c : implementation of the XML Schema handling and
 *             schema validity checking
 *
 * See Copyright for the status of this software.
 *
 * Daniel Veillard <veillard (at) redhat.com>
 */

/*
 * TODO:
 *   - when types are redefined in includes, check that all
 *     types in the redef list are equal
 *     -> need a type equality operation.
 *   - if we don't intend to use the schema for schemas, we
 *     need to validate all schema attributes (ref, type, name)
 *     against their types.
 *   - Eliminate item creation for: ??
 *
 * URGENT TODO:
 *   - For xsi-driven schema acquisition, augment the IDCs after every
 *     acquisition episode (xmlSchemaAugmentIDC).
 *
 * NOTES:
 *   - Elimated item creation for: <restriction>, <extension>,
 *     <simpleContent>, <complexContent>, <list>, <union>
 *
 * PROBLEMS:
 *   - http://lists.w3.org/Archives/Public/www-xml-schema-comments/2005JulSep/0337.html
 *     IDC XPath expression and chameleon includes: the targetNamespace is changed, so
 *     XPath will have trouble to resolve to this namespace, since not known.
 *
 *
 * CONSTRAINTS:
 *
 * Schema Component Constraint:
 *   All Group Limited (cos-all-limited)
 *   Status: complete
 *   (1.2)
 *     In xmlSchemaGroupDefReferenceTermFixup() and
 *   (2)
 *     In xmlSchemaParseModelGroup()
 *     TODO: Actually this should go to component-level checks,
 *     but is done here due to performance. Move it to an other layer
 *     is schema construction via an API is implemented.
 */
#define IN_LIBXML
#include "libxml.h"

#ifdef LIBXML_SCHEMAS_ENABLED

#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/hash.h>
#include <libxml/uri.h>
#include <libxml/xmlschemas.h>
#include <libxml/schemasInternals.h>
#include <libxml/xmlschemastypes.h>
#include <libxml/xmlautomata.h>
#include <libxml/xmlregexp.h>
#include <libxml/dict.h>
#include <libxml/encoding.h>
#include <libxml/xmlIO.h>
#ifdef LIBXML_PATTERN_ENABLED
#include <libxml/pattern.h>
#endif
#ifdef LIBXML_READER_ENABLED
#include <libxml/xmlreader.h>
#endif

/* #define DEBUG 1 */

/* #define DEBUG_CONTENT 1 */

/* #define DEBUG_TYPE 1 */

/* #define DEBUG_CONTENT_REGEXP 1 */

/* #define DEBUG_AUTOMATA 1 */

/* #define DEBUG_IDC */

/* #define DEBUG_IDC_NODE_TABLE */

/* #define WXS_ELEM_DECL_CONS_ENABLED */

#ifdef DEBUG_IDC
 #ifndef DEBUG_IDC_NODE_TABLE
  #define DEBUG_IDC_NODE_TABLE
 #endif
#endif

/* #define ENABLE_PARTICLE_RESTRICTION 1 */

#define ENABLE_REDEFINE

/* #define ENABLE_NAMED_LOCALS */

/* #define ENABLE_IDC_NODE_TABLES_TEST */

#define DUMP_CONTENT_MODEL

#ifdef LIBXML_READER_ENABLED
/* #define XML_SCHEMA_READER_ENABLED */
#endif

#define UNBOUNDED (1 << 30)
#define TODO 								\
    xmlGenericError(xmlGenericErrorContext,				\
	    "Unimplemented block at %s:%d\n",				\
            __FILE__, __LINE__);

#define XML_SCHEMAS_NO_NAMESPACE (const xmlChar *) "##"

/*
 * The XML Schemas namespaces
 */
static const xmlChar *xmlSchemaNs = (const xmlChar *)
    "http://www.w3.org/2001/XMLSchema";

static const xmlChar *xmlSchemaInstanceNs = (const xmlChar *)
    "http://www.w3.org/2001/XMLSchema-instance";

static const xmlChar *xmlNamespaceNs = (const xmlChar *)
    "http://www.w3.org/2000/xmlns/";

/*
* Come casting macros.
*/
#define ACTXT_CAST (xmlSchemaAbstractCtxtPtr)
#define PCTXT_CAST (xmlSchemaParserCtxtPtr)
#define VCTXT_CAST (xmlSchemaValidCtxtPtr)
#define WXS_BASIC_CAST (xmlSchemaBasicItemPtr)
#define WXS_TREE_CAST (xmlSchemaTreeItemPtr)
#define WXS_PTC_CAST (xmlSchemaParticlePtr)
#define WXS_TYPE_CAST (xmlSchemaTypePtr)
#define WXS_ELEM_CAST (xmlSchemaElementPtr)
#define WXS_ATTR_GROUP_CAST (xmlSchemaAttributeGroupPtr)
#define WXS_ATTR_CAST (xmlSchemaAttributePtr)
#define WXS_ATTR_USE_CAST (xmlSchemaAttributeUsePtr)
#define WXS_ATTR_PROHIB_CAST (xmlSchemaAttributeUseProhibPtr)
#define WXS_MODEL_GROUPDEF_CAST (xmlSchemaModelGroupDefPtr)
#define WXS_MODEL_GROUP_CAST (xmlSchemaModelGroupPtr)
#define WXS_IDC_CAST (xmlSchemaIDCPtr)
#define WXS_QNAME_CAST (xmlSchemaQNameRefPtr)
#define WXS_LIST_CAST (xmlSchemaItemListPtr)

/*
* Macros to query common properties of components.
*/
#define WXS_ITEM_NODE(i) xmlSchemaGetComponentNode(WXS_BASIC_CAST (i))

#define WXS_ITEM_TYPE_NAME(i) xmlSchemaGetComponentTypeStr(WXS_BASIC_CAST (i))
/*
* Macros for element declarations.
*/
#define WXS_ELEM_TYPEDEF(e) (e)->subtypes

#define WXS_SUBST_HEAD(item) (item)->refDecl
/*
* Macros for attribute declarations.
*/
#define WXS_ATTR_TYPEDEF(a) (a)->subtypes
/*
* Macros for attribute uses.
*/
#define WXS_ATTRUSE_DECL(au) WXS_ATTR_CAST (WXS_ATTR_USE_CAST (au))->attrDecl

#define WXS_ATTRUSE_TYPEDEF(au) WXS_ATTR_TYPEDEF(WXS_ATTRUSE_DECL( WXS_ATTR_USE_CAST au))

#define WXS_ATTRUSE_DECL_NAME(au) (WXS_ATTRUSE_DECL(au))->name

#define WXS_ATTRUSE_DECL_TNS(au) (WXS_ATTRUSE_DECL(au))->targetNamespace
/*
* Macros for attribute groups.
*/
#define WXS_ATTR_GROUP_HAS_REFS(ag) ((WXS_ATTR_GROUP_CAST (ag))->flags & XML_SCHEMAS_ATTRGROUP_HAS_REFS)
#define WXS_ATTR_GROUP_EXPANDED(ag) ((WXS_ATTR_GROUP_CAST (ag))->flags & XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED)
/*
* Macros for particles.
*/
#define WXS_PARTICLE(p) WXS_PTC_CAST (p)

#define WXS_PARTICLE_TERM(p) (WXS_PARTICLE(p))->children

#define WXS_PARTICLE_TERM_AS_ELEM(p) (WXS_ELEM_CAST WXS_PARTICLE_TERM(p))

#define WXS_PARTICLE_MODEL(p) WXS_MODEL_GROUP_CAST WXS_PARTICLE(p)->children
/*
* Macros for model groups definitions.
*/
#define WXS_MODELGROUPDEF_MODEL(mgd) (WXS_MODEL_GROUP_CAST (mgd))->children
/*
* Macros for model groups.
*/
#define WXS_IS_MODEL_GROUP(i) \
    (((i)->type == XML_SCHEMA_TYPE_SEQUENCE) || \
     ((i)->type == XML_SCHEMA_TYPE_CHOICE) || \
     ((i)->type == XML_SCHEMA_TYPE_ALL))

#define WXS_MODELGROUP_PARTICLE(mg) WXS_PTC_CAST (mg)->children
/*
* Macros for schema buckets.
*/
#define WXS_IS_BUCKET_INCREDEF(t) (((t) == XML_SCHEMA_SCHEMA_INCLUDE) || \
    ((t) == XML_SCHEMA_SCHEMA_REDEFINE))

#define WXS_IS_BUCKET_IMPMAIN(t) (((t) == XML_SCHEMA_SCHEMA_MAIN) || \
    ((t) == XML_SCHEMA_SCHEMA_IMPORT))

#define WXS_IMPBUCKET(b) ((xmlSchemaImportPtr) (b))

#define WXS_INCBUCKET(b) ((xmlSchemaIncludePtr) (b))
/*
* Macros for complex/simple types.
*/
#define WXS_IS_ANYTYPE(i) \
     (( (i)->type == XML_SCHEMA_TYPE_BASIC) && \
      ( (WXS_TYPE_CAST (i))->builtInType == XML_SCHEMAS_ANYTYPE))

#define WXS_IS_COMPLEX(i) \
    (((i)->type == XML_SCHEMA_TYPE_COMPLEX) || \
     ((i)->builtInType == XML_SCHEMAS_ANYTYPE))

#define WXS_IS_SIMPLE(item) \
    ((item->type == XML_SCHEMA_TYPE_SIMPLE) || \
     ((item->type == XML_SCHEMA_TYPE_BASIC) && \
      (item->builtInType != XML_SCHEMAS_ANYTYPE)))

#define WXS_IS_ANY_SIMPLE_TYPE(i) \
    (((i)->type == XML_SCHEMA_TYPE_BASIC) && \
      ((i)->builtInType == XML_SCHEMAS_ANYSIMPLETYPE))

#define WXS_IS_RESTRICTION(t) \
    ((t)->flags & XML_SCHEMAS_TYPE_DERIVATION_METHOD_RESTRICTION)

#define WXS_IS_EXTENSION(t) \
    ((t)->flags & XML_SCHEMAS_TYPE_DERIVATION_METHOD_EXTENSION)

#define WXS_IS_TYPE_NOT_FIXED(i) \
    (((i)->type != XML_SCHEMA_TYPE_BASIC) && \
     (((i)->flags & XML_SCHEMAS_TYPE_INTERNAL_RESOLVED) == 0))

#define WXS_IS_TYPE_NOT_FIXED_1(item) \
    (((item)->type != XML_SCHEMA_TYPE_BASIC) && \
     (((item)->flags & XML_SCHEMAS_TYPE_FIXUP_1) == 0))

#define WXS_TYPE_IS_GLOBAL(t) ((t)->flags & XML_SCHEMAS_TYPE_GLOBAL)

#define WXS_TYPE_IS_LOCAL(t) (((t)->flags & XML_SCHEMAS_TYPE_GLOBAL) == 0)
/*
* Macros for exclusively for complex types.
*/
#define WXS_HAS_COMPLEX_CONTENT(item) \
    ((item->contentType == XML_SCHEMA_CONTENT_MIXED) || \
     (item->contentType == XML_SCHEMA_CONTENT_EMPTY) || \
     (item->contentType == XML_SCHEMA_CONTENT_ELEMENTS))

#define WXS_HAS_SIMPLE_CONTENT(item) \
    ((item->contentType == XML_SCHEMA_CONTENT_SIMPLE) || \
     (item->contentType == XML_SCHEMA_CONTENT_BASIC))

#define WXS_HAS_MIXED_CONTENT(item) \
    (item->contentType == XML_SCHEMA_CONTENT_MIXED)

#define WXS_EMPTIABLE(t) \
    (xmlSchemaIsParticleEmptiable(WXS_PTC_CAST (t)->subtypes))

#define WXS_TYPE_CONTENTTYPE(t) (t)->subtypes

#define WXS_TYPE_PARTICLE(t) WXS_PTC_CAST (t)->subtypes

#define WXS_TYPE_PARTICLE_TERM(t) WXS_PARTICLE_TERM(WXS_TYPE_PARTICLE(t))
/*
* Macros for exclusively for simple types.
*/
#define WXS_LIST_ITEMTYPE(t) (t)->subtypes

#define WXS_IS_ATOMIC(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_ATOMIC)

#define WXS_IS_LIST(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_LIST)

#define WXS_IS_UNION(t) (t->flags & XML_SCHEMAS_TYPE_VARIETY_UNION)
/*
* Misc parser context macros.
*/
#define WXS_CONSTRUCTOR(ctx) (ctx)->constructor

#define WXS_HAS_BUCKETS(ctx) \
( (WXS_CONSTRUCTOR((ctx))->buckets != NULL) && \
(WXS_CONSTRUCTOR((ctx))->buckets->nbItems > 0) )

#define WXS_SUBST_GROUPS(ctx) WXS_CONSTRUCTOR((ctx))->substGroups

#define WXS_BUCKET(ctx) WXS_CONSTRUCTOR((ctx))->bucket

#define WXS_SCHEMA(ctx) (ctx)->schema

#define WXS_ADD_LOCAL(ctx, item) \
    xmlSchemaAddItemSize(&(WXS_BUCKET(ctx)->locals), 10, item)

#define WXS_ADD_GLOBAL(ctx, item) \
    xmlSchemaAddItemSize(&(WXS_BUCKET(ctx)->globals), 5, item)

#define WXS_ADD_PENDING(ctx, item) \
    xmlSchemaAddItemSize(&((ctx)->constructor->pending), 10, item)
/*
* xmlSchemaItemList macros.
*/
#define WXS_ILIST_IS_EMPTY(l) ((l == NULL) || ((l)->nbItems == 0))
/*
* Misc macros.
*/
#define IS_SCHEMA(node, type) \
   ((node != NULL) && (node->ns != NULL) && \
    (xmlStrEqual(node->name, (const xmlChar *) type)) && \
    (xmlStrEqual(node->ns->href, xmlSchemaNs)))

#define FREE_AND_NULL(str) if ((str) != NULL) { xmlFree((xmlChar *) (str)); str = NULL; }

/*
* Since we put the default/fixed values into the dict, we can
* use pointer comparison for those values.
* REMOVED: (xmlStrEqual((v1), (v2)))
*/
#define WXS_ARE_DEFAULT_STR_EQUAL(v1, v2) ((v1) == (v2))

#define INODE_NILLED(item) (item->flags & XML_SCHEMA_ELEM_INFO_NILLED)

#define CAN_PARSE_SCHEMA(b) (((b)->doc != NULL) && ((b)->parsed == 0))

#define HFAILURE if (res == -1) goto exit_failure;

#define HERROR if (res != 0) goto exit_error;

#define HSTOP(ctx) if ((ctx)->stop) goto exit;
/*
* Some flags used for various schema constraints.
*/
#define SUBSET_RESTRICTION  1<<0
#define SUBSET_EXTENSION    1<<1
#define SUBSET_SUBSTITUTION 1<<2
#define SUBSET_LIST         1<<3
#define SUBSET_UNION        1<<4

typedef struct _xmlSchemaNodeInfo xmlSchemaNodeInfo;
typedef xmlSchemaNodeInfo *xmlSchemaNodeInfoPtr;

typedef struct _xmlSchemaItemList xmlSchemaItemList;
typedef xmlSchemaItemList *xmlSchemaItemListPtr;
struct _xmlSchemaItemList {
    void **items;  /* used for dynamic addition of schemata */
    int nbItems; /* used for dynamic addition of schemata */
    int sizeItems; /* used for dynamic addition of schemata */
};

#define XML_SCHEMA_CTXT_PARSER 1
#define XML_SCHEMA_CTXT_VALIDATOR 2

typedef struct _xmlSchemaAbstractCtxt xmlSchemaAbstractCtxt;
typedef xmlSchemaAbstractCtxt *xmlSchemaAbstractCtxtPtr;
struct _xmlSchemaAbstractCtxt {
    int type; /* E.g. XML_SCHEMA_CTXT_VALIDATOR */
};

typedef struct _xmlSchemaBucket xmlSchemaBucket;
typedef xmlSchemaBucket *xmlSchemaBucketPtr;

#define XML_SCHEMA_SCHEMA_MAIN 0
#define XML_SCHEMA_SCHEMA_IMPORT 1
#define XML_SCHEMA_SCHEMA_INCLUDE 2
#define XML_SCHEMA_SCHEMA_REDEFINE 3

/**
 * xmlSchemaSchemaRelation:
 *
 * Used to create a graph of schema relationships.
 */
typedef struct _xmlSchemaSchemaRelation xmlSchemaSchemaRelation;
typedef xmlSchemaSchemaRelation *xmlSchemaSchemaRelationPtr;
struct _xmlSchemaSchemaRelation {
    xmlSchemaSchemaRelationPtr next;
    int type; /* E.g. XML_SCHEMA_SCHEMA_IMPORT */
    const xmlChar *importNamespace;
    xmlSchemaBucketPtr bucket;
};

#define XML_SCHEMA_BUCKET_MARKED 1<<0
#define XML_SCHEMA_BUCKET_COMPS_ADDED 1<<1

struct _xmlSchemaBucket {
    int type;
    int flags;
    const xmlChar *schemaLocation;
    const xmlChar *origTargetNamespace;
    const xmlChar *targetNamespace;
    xmlDocPtr doc;
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals; /* Global components. */
    xmlSchemaItemListPtr locals; /* Local components. */
};

/**
 * xmlSchemaImport:
 * (extends xmlSchemaBucket)
 *
 * Reflects a schema. Holds some information
 * about the schema and its toplevel components. Duplicate
 * toplevel components are not checked at this level.
 */
typedef struct _xmlSchemaImport xmlSchemaImport;
typedef xmlSchemaImport *xmlSchemaImportPtr;
struct _xmlSchemaImport {
    int type; /* Main OR import OR include. */
    int flags;
    const xmlChar *schemaLocation; /* The URI of the schema document. */
    /* For chameleon includes, @origTargetNamespace will be NULL */
    const xmlChar *origTargetNamespace;
    /*
    * For chameleon includes, @targetNamespace will be the
    * targetNamespace of the including schema.
    */
    const xmlChar *targetNamespace;
    xmlDocPtr doc; /* The schema node-tree. */
    /* @relations will hold any included/imported/redefined schemas. */
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals;
    xmlSchemaItemListPtr locals;
    /* The imported schema. */
    xmlSchemaPtr schema;
};

/*
* (extends xmlSchemaBucket)
*/
typedef struct _xmlSchemaInclude xmlSchemaInclude;
typedef xmlSchemaInclude *xmlSchemaIncludePtr;
struct _xmlSchemaInclude {
    int type;
    int flags;
    const xmlChar *schemaLocation;
    const xmlChar *origTargetNamespace;
    const xmlChar *targetNamespace;
    xmlDocPtr doc;
    xmlSchemaSchemaRelationPtr relations;
    int located;
    int parsed;
    int imported;
    int preserveDoc;
    xmlSchemaItemListPtr globals; /* Global components. */
    xmlSchemaItemListPtr locals; /* Local components. */

    /* The owning main or import schema bucket. */
    xmlSchemaImportPtr ownerImport;
};

/**
 * xmlSchemaBasicItem:
 *
 * The abstract base type for schema components.
 */
typedef struct _xmlSchemaBasicItem xmlSchemaBasicItem;
typedef xmlSchemaBasicItem *xmlSchemaBasicItemPtr;
struct _xmlSchemaBasicItem {
    xmlSchemaTypeType type;
};

/**
 * xmlSchemaAnnotItem:
 *
 * The abstract base type for annotated schema components.
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaAnnotItem xmlSchemaAnnotItem;
typedef xmlSchemaAnnotItem *xmlSchemaAnnotItemPtr;
struct _xmlSchemaAnnotItem {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
};

/**
 * xmlSchemaTreeItem:
 *
 * The abstract base type for tree-like structured schema components.
 * (Extends xmlSchemaAnnotItem)
 */
typedef struct _xmlSchemaTreeItem xmlSchemaTreeItem;
typedef xmlSchemaTreeItem *xmlSchemaTreeItemPtr;
struct _xmlSchemaTreeItem {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next;
    xmlSchemaTreeItemPtr children;
};


#define XML_SCHEMA_ATTR_USE_FIXED 1<<0
/**
 * xmlSchemaAttributeUsePtr:
 *
 * The abstract base type for tree-like structured schema components.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaAttributeUse xmlSchemaAttributeUse;
typedef xmlSchemaAttributeUse *xmlSchemaAttributeUsePtr;
struct _xmlSchemaAttributeUse {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaAttributeUsePtr next; /* The next attr. use. */
    /*
    * The attr. decl. OR a QName-ref. to an attr. decl. OR
    * a QName-ref. to an attribute group definition.
    */
    xmlSchemaAttributePtr attrDecl;

    int flags;
    xmlNodePtr node;
    int occurs; /* required, optional */
    const xmlChar * defValue;
    xmlSchemaValPtr defVal;
};

/**
 * xmlSchemaAttributeUseProhibPtr:
 *
 * A helper component to reflect attribute prohibitions.
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaAttributeUseProhib xmlSchemaAttributeUseProhib;
typedef xmlSchemaAttributeUseProhib *xmlSchemaAttributeUseProhibPtr;
struct _xmlSchemaAttributeUseProhib {
    xmlSchemaTypeType type; /* == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB */
    xmlNodePtr node;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    int isRef;
};

/**
 * xmlSchemaRedef:
 */
typedef struct _xmlSchemaRedef xmlSchemaRedef;
typedef xmlSchemaRedef *xmlSchemaRedefPtr;
struct _xmlSchemaRedef {
    xmlSchemaRedefPtr next;
    xmlSchemaBasicItemPtr item; /* The redefining component. */
    xmlSchemaBasicItemPtr reference; /* The referencing component. */
    xmlSchemaBasicItemPtr target; /* The to-be-redefined component. */
    const xmlChar *refName; /* The name of the to-be-redefined component. */
    const xmlChar *refTargetNs; /* The target namespace of the
                                   to-be-redefined comp. */
    xmlSchemaBucketPtr targetBucket; /* The redefined schema. */
};

/**
 * xmlSchemaConstructionCtxt:
 */
typedef struct _xmlSchemaConstructionCtxt xmlSchemaConstructionCtxt;
typedef xmlSchemaConstructionCtxt *xmlSchemaConstructionCtxtPtr;
struct _xmlSchemaConstructionCtxt {
    xmlSchemaPtr mainSchema; /* The main schema. */
    xmlSchemaBucketPtr mainBucket; /* The main schema bucket */
    xmlDictPtr dict;
    xmlSchemaItemListPtr buckets; /* List of schema buckets. */
    /* xmlSchemaItemListPtr relations; */ /* List of schema relations. */
    xmlSchemaBucketPtr bucket; /* The current schema bucket */
    xmlSchemaItemListPtr pending; /* All Components of all schemas that
                                     need to be fixed. */
    xmlHashTablePtr substGroups;
    xmlSchemaRedefPtr redefs;
    xmlSchemaRedefPtr lastRedef;
};

#define XML_SCHEMAS_PARSE_ERROR		1
#define SCHEMAS_PARSE_OPTIONS XML_PARSE_NOENT

struct _xmlSchemaParserCtxt {
    int type;
    void *errCtxt;             /* user specific error context */
    xmlSchemaValidityErrorFunc error;   /* the callback in case of errors */
    xmlSchemaValidityWarningFunc warning;       /* the callback in case of warning */
    int err;
    int nberrors;
    xmlStructuredErrorFunc serror;

    xmlSchemaConstructionCtxtPtr constructor;
    int ownsConstructor; /* TODO: Move this to parser *flags*. */

    /* xmlSchemaPtr topschema;	*/
    /* xmlHashTablePtr namespaces;  */

    xmlSchemaPtr schema;        /* The main schema in use */
    int counter;

    const xmlChar *URL;
    xmlDocPtr doc;
    int preserve;		/* Whether the doc should be freed  */

    const char *buffer;
    int size;

    /*
     * Used to build complex element content models
     */
    xmlAutomataPtr am;
    xmlAutomataStatePtr start;
    xmlAutomataStatePtr end;
    xmlAutomataStatePtr state;

    xmlDictPtr dict;		/* dictionnary for interned string names */
    xmlSchemaTypePtr ctxtType; /* The current context simple/complex type */
    int options;
    xmlSchemaValidCtxtPtr vctxt;
    int isS4S;
    int isRedefine;
    int xsiAssemble;
    int stop; /* If the parser should stop; i.e. a critical error. */
    const xmlChar *targetNamespace;
    xmlSchemaBucketPtr redefined; /* The schema to be redefined. */

    xmlSchemaRedefPtr redef; /* Used for redefinitions. */
    int redefCounter; /* Used for redefinitions. */
    xmlSchemaItemListPtr attrProhibs;
};

/**
 * xmlSchemaQNameRef:
 *
 * A component reference item (not a schema component)
 * (Extends xmlSchemaBasicItem)
 */
typedef struct _xmlSchemaQNameRef xmlSchemaQNameRef;
typedef xmlSchemaQNameRef *xmlSchemaQNameRefPtr;
struct _xmlSchemaQNameRef {
    xmlSchemaTypeType type;
    xmlSchemaBasicItemPtr item; /* The resolved referenced item. */
    xmlSchemaTypeType itemType;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlNodePtr node;
};

/**
 * xmlSchemaParticle:
 *
 * A particle component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaParticle xmlSchemaParticle;
typedef xmlSchemaParticle *xmlSchemaParticlePtr;
struct _xmlSchemaParticle {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* next particle */
    xmlSchemaTreeItemPtr children; /* the "term" (e.g. a model group,
	a group definition, a XML_SCHEMA_EXTRA_QNAMEREF (if a reference),
        etc.) */
    int minOccurs;
    int maxOccurs;
    xmlNodePtr node;
};

/**
 * xmlSchemaModelGroup:
 *
 * A model group component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaModelGroup xmlSchemaModelGroup;
typedef xmlSchemaModelGroup *xmlSchemaModelGroupPtr;
struct _xmlSchemaModelGroup {
    xmlSchemaTypeType type; /* XML_SCHEMA_TYPE_SEQUENCE, XML_SCHEMA_TYPE_CHOICE, XML_SCHEMA_TYPE_ALL */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* not used */
    xmlSchemaTreeItemPtr children; /* first particle (OR "element decl" OR "wildcard") */
    xmlNodePtr node;
};

#define XML_SCHEMA_MODEL_GROUP_DEF_MARKED 1<<0
#define XML_SCHEMA_MODEL_GROUP_DEF_REDEFINED 1<<1
/**
 * xmlSchemaModelGroupDef:
 *
 * A model group definition component.
 * (Extends xmlSchemaTreeItem)
 */
typedef struct _xmlSchemaModelGroupDef xmlSchemaModelGroupDef;
typedef xmlSchemaModelGroupDef *xmlSchemaModelGroupDefPtr;
struct _xmlSchemaModelGroupDef {
    xmlSchemaTypeType type; /* XML_SCHEMA_TYPE_GROUP */
    xmlSchemaAnnotPtr annot;
    xmlSchemaTreeItemPtr next; /* not used */
    xmlSchemaTreeItemPtr children; /* the "model group" */
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlNodePtr node;
    int flags;
};

typedef struct _xmlSchemaIDC xmlSchemaIDC;
typedef xmlSchemaIDC *xmlSchemaIDCPtr;

/**
 * xmlSchemaIDCSelect:
 *
 * The identity-constraint "field" and "selector" item, holding the
 * XPath expression.
 */
typedef struct _xmlSchemaIDCSelect xmlSchemaIDCSelect;
typedef xmlSchemaIDCSelect *xmlSchemaIDCSelectPtr;
struct _xmlSchemaIDCSelect {
    xmlSchemaIDCSelectPtr next;
    xmlSchemaIDCPtr idc;
    int index; /* an index position if significant for IDC key-sequences */
    const xmlChar *xpath; /* the XPath expression */
    void *xpathComp; /* the compiled XPath expression */
};

/**
 * xmlSchemaIDC:
 *
 * The identity-constraint definition component.
 * (Extends xmlSchemaAnnotItem)
 */

struct _xmlSchemaIDC {
    xmlSchemaTypeType type;
    xmlSchemaAnnotPtr annot;
    xmlSchemaIDCPtr next;
    xmlNodePtr node;
    const xmlChar *name;
    const xmlChar *targetNamespace;
    xmlSchemaIDCSelectPtr selector;
    xmlSchemaIDCSelectPtr fields;
    int nbFields;
    xmlSchemaQNameRefPtr ref;
};

/**
 * xmlSchemaIDCAug:
 *
 * The augmented IDC information used for validation.
 */
typedef struct _xmlSchemaIDCAug xmlSchemaIDCAug;
typedef xmlSchemaIDCAug *xmlSchemaIDCAugPtr;
struct _xmlSchemaIDCAug {
    xmlSchemaIDCAugPtr next; /* next in a list */
    xmlSchemaIDCPtr def; /* the IDC definition */
    int keyrefDepth; /* the lowest tree level to which IDC
                        tables need to be bubbled upwards */
};

/**
 * xmlSchemaPSVIIDCKeySequence:
 *
 * The key sequence of a node table item.
 */
typedef struct _xmlSchemaPSVIIDCKey xmlSchemaPSVIIDCKey;
typedef xmlSchemaPSVIIDCKey *xmlSchemaPSVIIDCKeyPtr;
struct _xmlSchemaPSVIIDCKey {
    xmlSchemaTypePtr type;
    xmlSchemaValPtr val;
};

/**
 * xmlSchemaPSVIIDCNode:
 *
 * The node table item of a node table.
 */
typedef struct _xmlSchemaPSVIIDCNode xmlSchemaPSVIIDCNode;
typedef xmlSchemaPSVIIDCNode *xmlSchemaPSVIIDCNodePtr;
struct _xmlSchemaPSVIIDCNode {
    xmlNodePtr node;
    xmlSchemaPSVIIDCKeyPtr *keys;
    int nodeLine;
    int nodeQNameID;

};

/**
 * xmlSchemaPSVIIDCBinding:
 *
 * The identity-constraint binding item of the [identity-constraint table].
 */
typedef struct _xmlSchemaPSVIIDCBinding xmlSchemaPSVIIDCBinding;
typedef xmlSchemaPSVIIDCBinding *xmlSchemaPSVIIDCBindingPtr;
struct _xmlSchemaPSVIIDCBinding {
    xmlSchemaPSVIIDCBindingPtr next; /* next binding of a specific node */
    xmlSchemaIDCPtr definition; /* the IDC definition */
    xmlSchemaPSVIIDCNodePtr *nodeTable; /* array of key-sequences */
    int nbNodes; /* number of entries in the node table */
    int sizeNodes; /* size of the node table */
    xmlSchemaItemListPtr dupls;
};


#define XPATH_STATE_OBJ_TYPE_IDC_SELECTOR 1
#define XPATH_STATE_OBJ_TYPE_IDC_FIELD 2

#define XPATH_STATE_OBJ_MATCHES -2
#define XPATH_STATE_OBJ_BLOCKED -3

typedef struct _xmlSchemaIDCMatcher xmlSchemaIDCMatcher;
typedef xmlSchemaIDCMatcher *xmlSchemaIDCMatcherPtr;

/**
 * xmlSchemaIDCStateObj:
 *
 * The state object used to evaluate XPath expressions.
 */
typedef struct _xmlSchemaIDCStateObj xmlSchemaIDCStateObj;
typedef xmlSchemaIDCStateObj *xmlSchemaIDCStateObjPtr;
struct _xmlSchemaIDCStateObj {
    int type;
    xmlSchemaIDCStateObjPtr next; /* next if in a list */
    int depth; /* depth of creation */
    int *history; /* list of (depth, state-id) tuples */
    int nbHistory;
    int sizeHistory;
    xmlSchemaIDCMatcherPtr matcher; /* the correspondent field/selector
                                       matcher */
    xmlSchemaIDCSelectPtr sel;
    void *xpathCtxt;
};

#define IDC_MATCHER 0

/**
 * xmlSchemaIDCMatcher:
 *
 * Used to evaluate IDC selectors (and fields).
 */
struct _xmlSchemaIDCMatcher {
    int type;
    int depth; /* the tree depth at creation time */
    xmlSchemaIDCMatcherPtr next; /* next in the list */
    xmlSchemaIDCMatcherPtr nextCached; /* next in the cache list */
    xmlSchemaIDCAugPtr aidc; /* the augmented IDC item */
    int idcType;
    xmlSchemaPSVIIDCKeyPtr **keySeqs; /* the key-sequences of the target
                                         elements */
    int sizeKeySeqs;
    xmlSchemaItemListPtr targets; /* list of target-node
                                     (xmlSchemaPSVIIDCNodePtr) entries */
};

/*
* Element info flags.
*/
#define XML_SCHEMA_NODE_INFO_FLAG_OWNED_NAMES  1<<0
#define XML_SCHEMA_NODE_INFO_FLAG_OWNED_VALUES 1<<1
#define XML_SCHEMA_ELEM_INFO_NILLED	       1<<2
#define XML_SCHEMA_ELEM_INFO_LOCAL_TYPE	       1<<3

#define XML_SCHEMA_NODE_INFO_VALUE_NEEDED      1<<4
#define XML_SCHEMA_ELEM_INFO_EMPTY             1<<5
#define XML_SCHEMA_ELEM_INFO_HAS_CONTENT       1<<6

#define XML_SCHEMA_ELEM_INFO_HAS_ELEM_CONTENT  1<<7
#define XML_SCHEMA_ELEM_INFO_ERR_BAD_CONTENT  1<<8
#define XML_SCHEMA_NODE_INFO_ERR_NOT_EXPECTED  1<<9
#define XML_SCHEMA_NODE_INFO_ERR_BAD_TYPE  1<<10

/**
 * xmlSchemaNodeInfo:
 *
 * Holds information of an element node.
 */
struct _xmlSchemaNodeInfo {
    int nodeType;
    xmlNodePtr node;
    int nodeLine;
    const xmlChar *localName;
    const xmlChar *nsName;
    const xmlChar *value;
    xmlSchemaValPtr val; /* the pre-computed value if any */
    xmlSchemaTypePtr typeDef; /* the complex/simple type definition if any */

    int flags; /* combination of node info flags */

    int valNeeded;
    int normVal;

    xmlSchemaElementPtr decl; /* the element/attribute declaration */
    int depth;
    xmlSchemaPSVIIDCBindingPtr idcTable; /* the table of PSVI IDC bindings
                                            for the scope element*/
    xmlSchemaIDCMatcherPtr idcMatchers; /* the IDC matchers for the scope
                                           element */
    xmlRegExecCtxtPtr regexCtxt;

    const xmlChar **nsBindings; /* Namespace bindings on this element */
    int nbNsBindings;
    int sizeNsBindings;

    int hasKeyrefs;
    int appliedXPath; /* Indicates that an XPath has been applied. */
};

#define XML_SCHEMAS_ATTR_UNKNOWN 1
#define XML_SCHEMAS_ATTR_ASSESSED 2
#define XML_SCHEMAS_ATTR_PROHIBITED 3
#define XML_SCHEMAS_ATTR_ERR_MISSING 4
#define XML_SCHEMAS_ATTR_INVALID_VALUE 5
#define XML_SCHEMAS_ATTR_ERR_NO_TYPE 6
#define XML_SCHEMAS_ATTR_ERR_FIXED_VALUE 7
#define XML_SCHEMAS_ATTR_DEFAULT 8
#define XML_SCHEMAS_ATTR_VALIDATE_VALUE 9
#define XML_SCHEMAS_ATTR_ERR_WILD_STRICT_NO_DECL 10
#define XML_SCHEMAS_ATTR_HAS_ATTR_USE 11
#define XML_SCHEMAS_ATTR_HAS_ATTR_DECL 12
#define XML_SCHEMAS_ATTR_WILD_SKIP 13
#define XML_SCHEMAS_ATTR_WILD_LAX_NO_DECL 14
#define XML_SCHEMAS_ATTR_ERR_WILD_DUPLICATE_ID 15
#define XML_SCHEMAS_ATTR_ERR_WILD_AND_USE_ID 16
#define XML_SCHEMAS_ATTR_META 17
/*
* @metaType values of xmlSchemaAttrInfo.
*/
#define XML_SCHEMA_ATTR_INFO_META_XSI_TYPE 1
#define XML_SCHEMA_ATTR_INFO_META_XSI_NIL 2
#define XML_SCHEMA_ATTR_INFO_META_XSI_SCHEMA_LOC 3
#define XML_SCHEMA_ATTR_INFO_META_XSI_NO_NS_SCHEMA_LOC 4
#define XML_SCHEMA_ATTR_INFO_META_XMLNS 5

typedef struct _xmlSchemaAttrInfo xmlSchemaAttrInfo;
typedef xmlSchemaAttrInfo *xmlSchemaAttrInfoPtr;
struct _xmlSchemaAttrInfo {
    int nodeType;
    xmlNodePtr node;
    int nodeLine;
    const xmlChar *localName;
    const xmlChar *nsName;
    const xmlChar *value;
    xmlSchemaValPtr val; /* the pre-computed value if any */
    xmlSchemaTypePtr typeDef; /* the complex/simple type definition if any */
    int flags; /* combination of node info flags */

    xmlSchemaAttributePtr decl; /* the attribute declaration */
    xmlSchemaAttributeUsePtr use;  /* the attribute use */
    int state;
    int metaType;
    const xmlChar *vcValue; /* the value constraint value */
    xmlSchemaNodeInfoPtr parent;
};


#define XML_SCHEMA_VALID_CTXT_FLAG_STREAM 1
/**
 * xmlSchemaValidCtxt:
 *
 * A Schemas validation context
 */
struct _xmlSchemaValidCtxt {
    int type;
    void *errCtxt;             /* user specific data block */
    xmlSchemaValidityErrorFunc error;   /* the callback in case of errors */
    xmlSchemaValidityWarningFunc warning; /* the callback in case of warning */
    xmlStructuredErrorFunc serror;

    xmlSchemaPtr schema;        /* The schema in use */
    xmlDocPtr doc;
    xmlParserInputBufferPtr input;
    xmlCharEncoding enc;
    xmlSAXHandlerPtr sax;
    xmlParserCtxtPtr parserCtxt;
    void *user_data; /* TODO: What is this for? */

    int err;
    int nberrors;

    xmlNodePtr node;
    xmlNodePtr cur;
    /* xmlSchemaTypePtr type; */

    xmlRegExecCtxtPtr regexp;
    xmlSchemaValPtr value;

    int valueWS;
    int options;
    xmlNodePtr validationRoot;
    xmlSchemaParserCtxtPtr pctxt;
    int xsiAssemble;

    int depth;
    xmlSchemaNodeInfoPtr *elemInfos; /* array of element informations */
    int sizeElemInfos;
    xmlSchemaNodeInfoPtr inode; /* the current element information */

    xmlSchemaIDCAugPtr aidcs; /* a list of augmented IDC informations */

    xmlSchemaIDCStateObjPtr xpathStates; /* first active state object. */
    xmlSchemaIDCStateObjPtr xpathStatePool; /* first stored state object. */
    xmlSchemaIDCMatcherPtr idcMatcherCache; /* Cache for IDC matcher objects. */

    xmlSchemaPSVIIDCNodePtr *idcNodes; /* list of all IDC node-table entries*/
    int nbIdcNodes;
    int sizeIdcNodes;

    xmlSchemaPSVIIDCKeyPtr *idcKeys; /* list of all IDC node-table entries */
    int nbIdcKeys;
    int sizeIdcKeys;

    int flags;

    xmlDictPtr dict;

#ifdef LIBXML_READER_ENABLED
    xmlTextReaderPtr reader;
#endif

    xmlSchemaAttrInfoPtr *attrInfos;
    int nbAttrInfos;
    int sizeAttrInfos;

    int skipDepth;
    xmlSchemaItemListPtr nodeQNames;
    int hasKeyrefs;
    int createIDCNodeTables;
    int psviExposeIDCNodeTables;
};

/**
 * xmlSchemaSubstGroup:
 *
 *
 */
typedef struct _xmlSchemaSubstGroup xmlSchemaSubstGroup;
typedef xmlSchemaSubstGroup *xmlSchemaSubstGroupPtr;
struct _xmlSchemaSubstGroup {
    xmlSchemaElementPtr head;
    xmlSchemaItemListPtr members;
};

/************************************************************************
 * 									*
 * 			Some predeclarations				*
 * 									*
 ************************************************************************/

static int xmlSchemaParseInclude(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaPtr schema,
                                 xmlNodePtr node);
static int xmlSchemaParseRedefine(xmlSchemaParserCtxtPtr ctxt,
                                 xmlSchemaPtr schema,
                                 xmlNodePtr node);
static int
xmlSchemaTypeFixup(xmlSchemaTypePtr type,
                   xmlSchemaAbstractCtxtPtr ctxt);
static const xmlChar *
xmlSchemaFacetTypeToString(xmlSchemaTypeType type);
static int
xmlSchemaParseImport(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                     xmlNodePtr node);
static int
xmlSchemaCheckFacetValues(xmlSchemaTypePtr typeDecl,
                       xmlSchemaParserCtxtPtr ctxt);
static void
xmlSchemaClearValidCtxt(xmlSchemaValidCtxtPtr vctxt);
static xmlSchemaWhitespaceValueType
xmlSchemaGetWhiteSpaceFacetValue(xmlSchemaTypePtr type);
static xmlSchemaTreeItemPtr
xmlSchemaParseModelGroup(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
			 xmlNodePtr node, xmlSchemaTypeType type,
			 int withParticle);
static const xmlChar *
xmlSchemaGetComponentTypeStr(xmlSchemaBasicItemPtr item);
static xmlSchemaTypeLinkPtr
xmlSchemaGetUnionSimpleTypeMemberTypes(xmlSchemaTypePtr type);
static void
xmlSchemaInternalErr(xmlSchemaAbstractCtxtPtr actxt,
		     const char *funcName,
		     const char *message);
static int
xmlSchemaCheckCOSSTDerivedOK(xmlSchemaAbstractCtxtPtr ctxt,
			     xmlSchemaTypePtr type,
			     xmlSchemaTypePtr baseType,
			     int subset);
static void
xmlSchemaCheckElementDeclComponent(xmlSchemaElementPtr elemDecl,
				   xmlSchemaParserCtxtPtr ctxt);
static void
xmlSchemaComponentListFree(xmlSchemaItemListPtr list);
static xmlSchemaQNameRefPtr
xmlSchemaParseAttributeGroupRef(xmlSchemaParserCtxtPtr pctxt,
				xmlSchemaPtr schema,
				xmlNodePtr node);

/************************************************************************
 *									*
 * 			Helper functions			        *
 *									*
 ************************************************************************/

/**
 * xmlSchemaItemTypeToStr:
 * @type: the type of the schema item
 *
 * Returns the component name of a schema item.
 */
static const xmlChar *
xmlSchemaItemTypeToStr(xmlSchemaTypeType type)
{
    switch (type) {
	case XML_SCHEMA_TYPE_BASIC:
	    return(BAD_CAST "simple type definition");
	case XML_SCHEMA_TYPE_SIMPLE:
	    return(BAD_CAST "simple type definition");
	case XML_SCHEMA_TYPE_COMPLEX:
	    return(BAD_CAST "complex type definition");
	case XML_SCHEMA_TYPE_ELEMENT:
	    return(BAD_CAST "element declaration");
	case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
	    return(BAD_CAST "attribute use");
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    return(BAD_CAST "attribute declaration");
	case XML_SCHEMA_TYPE_GROUP:
	    return(BAD_CAST "model group definition");
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    return(BAD_CAST "attribute group definition");
	case XML_SCHEMA_TYPE_NOTATION:
	    return(BAD_CAST "notation declaration");
	case XML_SCHEMA_TYPE_SEQUENCE:
	    return(BAD_CAST "model group (sequence)");
	case XML_SCHEMA_TYPE_CHOICE:
	    return(BAD_CAST "model group (choice)");
	case XML_SCHEMA_TYPE_ALL:
	    return(BAD_CAST "model group (all)");
	case XML_SCHEMA_TYPE_PARTICLE:
	    return(BAD_CAST "particle");
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	    return(BAD_CAST "unique identity-constraint");
	    /* return(BAD_CAST "IDC (unique)"); */
	case XML_SCHEMA_TYPE_IDC_KEY:
	    return(BAD_CAST "key identity-constraint");
	    /* return(BAD_CAST "IDC (key)"); */
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    return(BAD_CAST "keyref identity-constraint");
	    /* return(BAD_CAST "IDC (keyref)"); */
	case XML_SCHEMA_TYPE_ANY:
	    return(BAD_CAST "wildcard (any)");
	case XML_SCHEMA_EXTRA_QNAMEREF:
	    return(BAD_CAST "[helper component] QName reference");
	case XML_SCHEMA_EXTRA_ATTR_USE_PROHIB:
	    return(BAD_CAST "[helper component] attribute use prohibition");
	default:
	    return(BAD_CAST "Not a schema component");
    }
}

/**
 * xmlSchemaGetComponentTypeStr:
 * @type: the type of the schema item
 *
 * Returns the component name of a schema item.
 */
static const xmlChar *
xmlSchemaGetComponentTypeStr(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_BASIC:
	    if (WXS_IS_COMPLEX(WXS_TYPE_CAST item))
		return(BAD_CAST "complex type definition");
	    else
		return(BAD_CAST "simple type definition");
	default:
	    return(xmlSchemaItemTypeToStr(item->type));
    }
}

/**
 * xmlSchemaGetComponentNode:
 * @item: a schema component
 *
 * Returns node associated with the schema component.
 * NOTE that such a node need not be available; plus, a component's
 * node need not to reflect the component directly, since there is no
 * one-to-one relationship between the XML Schema representation and
 * the component representation.
 */
static xmlNodePtr
xmlSchemaGetComponentNode(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_ELEMENT:
	    return (((xmlSchemaElementPtr) item)->node);
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    return (((xmlSchemaAttributePtr) item)->node);
	case XML_SCHEMA_TYPE_COMPLEX:
	case XML_SCHEMA_TYPE_SIMPLE:
	    return (((xmlSchemaTypePtr) item)->node);
	case XML_SCHEMA_TYPE_ANY:
	case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
	    return (((xmlSchemaWildcardPtr) item)->node);
	case XML_SCHEMA_TYPE_PARTICLE:
	    return (((xmlSchemaParticlePtr) item)->node);
	case XML_SCHEMA_TYPE_SEQUENCE:
	case XML_SCHEMA_TYPE_CHOICE:
	case XML_SCHEMA_TYPE_ALL:
	    return (((xmlSchemaModelGroupPtr) item)->node);
	case XML_SCHEMA_TYPE_GROUP:
	    return (((xmlSchemaModelGroupDefPtr) item)->node);
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    return (((xmlSchemaAttributeGroupPtr) item)->node);
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    return (((xmlSchemaIDCPtr) item)->node);
	case XML_SCHEMA_EXTRA_QNAMEREF:
	    return(((xmlSchemaQNameRefPtr) item)->node);
	/* TODO: What to do with NOTATIONs?
	case XML_SCHEMA_TYPE_NOTATION:
	    return (((xmlSchemaNotationPtr) item)->node);
	*/
	case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
	    return (((xmlSchemaAttributeUsePtr) item)->node);
	default:
	    return (NULL);
    }
}

#if 0
/**
 * xmlSchemaGetNextComponent:
 * @item: a schema component
 *
 * Returns the next sibling of the schema component.
 */
static xmlSchemaBasicItemPtr
xmlSchemaGetNextComponent(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_ELEMENT:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaElementPtr) item)->next);
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaAttributePtr) item)->next);
	case XML_SCHEMA_TYPE_COMPLEX:
	case XML_SCHEMA_TYPE_SIMPLE:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaTypePtr) item)->next);
	case XML_SCHEMA_TYPE_ANY:
	case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
	    return (NULL);
	case XML_SCHEMA_TYPE_PARTICLE:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaParticlePtr) item)->next);
	case XML_SCHEMA_TYPE_SEQUENCE:
	case XML_SCHEMA_TYPE_CHOICE:
	case XML_SCHEMA_TYPE_ALL:
	    return (NULL);
	case XML_SCHEMA_TYPE_GROUP:
	    return (NULL);
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaAttributeGroupPtr) item)->next);
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    return ((xmlSchemaBasicItemPtr) ((xmlSchemaIDCPtr) item)->next);
	default:
	    return (NULL);
    }
}
#endif


/**
 * xmlSchemaFormatQName:
 * @buf: the string buffer
 * @namespaceName:  the namespace name
 * @localName: the local name
 *
 * Returns the given QName in the format "{namespaceName}localName" or
 * just "localName" if @namespaceName is NULL.
 *
 * Returns the localName if @namespaceName is NULL, a formatted
 * string otherwise.
 */
static const xmlChar*
xmlSchemaFormatQName(xmlChar **buf,
		     const xmlChar *namespaceName,
		     const xmlChar *localName)
{
    FREE_AND_NULL(*buf)
    if (namespaceName != NULL) {
	*buf = xmlStrdup(BAD_CAST "{");
	*buf = xmlStrcat(*buf, namespaceName);
	*buf = xmlStrcat(*buf, BAD_CAST "}");
    }
    if (localName != NULL) {
	if (namespaceName == NULL)
	    return(localName);
	*buf = xmlStrcat(*buf, localName);
    } else {
	*buf = xmlStrcat(*buf, BAD_CAST "(NULL)");
    }
    return ((const xmlChar *) *buf);
}

static const xmlChar*
xmlSchemaFormatQNameNs(xmlChar **buf, xmlNsPtr ns, const xmlChar *localName)
{
    if (ns != NULL)
	return (xmlSchemaFormatQName(buf, ns->href, localName));
    else
	return (xmlSchemaFormatQName(buf, NULL, localName));
}

static const xmlChar *
xmlSchemaGetComponentName(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_ELEMENT:
	    return (((xmlSchemaElementPtr) item)->name);
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    return (((xmlSchemaAttributePtr) item)->name);
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    return (((xmlSchemaAttributeGroupPtr) item)->name);
	case XML_SCHEMA_TYPE_BASIC:
	case XML_SCHEMA_TYPE_SIMPLE:
	case XML_SCHEMA_TYPE_COMPLEX:
	    return (((xmlSchemaTypePtr) item)->name);
	case XML_SCHEMA_TYPE_GROUP:
	    return (((xmlSchemaModelGroupDefPtr) item)->name);
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    return (((xmlSchemaIDCPtr) item)->name);
	case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
	    if (WXS_ATTRUSE_DECL(item) != NULL) {
		return(xmlSchemaGetComponentName(
		    WXS_BASIC_CAST WXS_ATTRUSE_DECL(item)));
	    } else
		return(NULL);
	case XML_SCHEMA_EXTRA_QNAMEREF:
	    return (((xmlSchemaQNameRefPtr) item)->name);
	case XML_SCHEMA_TYPE_NOTATION:
	    return (((xmlSchemaNotationPtr) item)->name);
	default:
	    /*
	    * Other components cannot have names.
	    */
	    break;
    }
    return (NULL);
}

#define xmlSchemaGetQNameRefName(r) (WXS_QNAME_CAST (r))->name
#define xmlSchemaGetQNameRefTargetNs(r) (WXS_QNAME_CAST (r))->targetNamespace
/*
static const xmlChar *
xmlSchemaGetQNameRefName(void *ref)
{
    return(((xmlSchemaQNameRefPtr) ref)->name);
}

static const xmlChar *
xmlSchemaGetQNameRefTargetNs(void *ref)
{
    return(((xmlSchemaQNameRefPtr) ref)->targetNamespace);
}
*/

static const xmlChar *
xmlSchemaGetComponentTargetNs(xmlSchemaBasicItemPtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_ELEMENT:
	    return (((xmlSchemaElementPtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    return (((xmlSchemaAttributePtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    return (((xmlSchemaAttributeGroupPtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_BASIC:
	    return (BAD_CAST "http://www.w3.org/2001/XMLSchema");
	case XML_SCHEMA_TYPE_SIMPLE:
	case XML_SCHEMA_TYPE_COMPLEX:
	    return (((xmlSchemaTypePtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_GROUP:
	    return (((xmlSchemaModelGroupDefPtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    return (((xmlSchemaIDCPtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
	    if (WXS_ATTRUSE_DECL(item) != NULL) {
		return(xmlSchemaGetComponentTargetNs(
		    WXS_BASIC_CAST WXS_ATTRUSE_DECL(item)));
	    }
	    /* TODO: Will returning NULL break something? */
	    break;
	case XML_SCHEMA_EXTRA_QNAMEREF:
	    return (((xmlSchemaQNameRefPtr) item)->targetNamespace);
	case XML_SCHEMA_TYPE_NOTATION:
	    return (((xmlSchemaNotationPtr) item)->targetNamespace);
	default:
	    /*
	    * Other components cannot have names.
	    */
	    break;
    }
    return (NULL);
}

static const xmlChar*
xmlSchemaGetComponentQName(xmlChar **buf,
			   void *item)
{
    return (xmlSchemaFormatQName(buf,
	xmlSchemaGetComponentTargetNs((xmlSchemaBasicItemPtr) item),
	xmlSchemaGetComponentName((xmlSchemaBasicItemPtr) item)));
}

static const xmlChar*
xmlSchemaGetComponentDesignation(xmlChar **buf, void *item)
{
    xmlChar *str = NULL;

    *buf = xmlStrcat(*buf, WXS_ITEM_TYPE_NAME(item));
    *buf = xmlStrcat(*buf, BAD_CAST " '");
    *buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str,
	(xmlSchemaBasicItemPtr) item));
    *buf = xmlStrcat(*buf, BAD_CAST "'");
    FREE_AND_NULL(str);
    return(*buf);
}

static const xmlChar*
xmlSchemaGetIDCDesignation(xmlChar **buf, xmlSchemaIDCPtr idc)
{
    return(xmlSchemaGetComponentDesignation(buf, idc));
}

/**
 * xmlSchemaWildcardPCToString:
 * @pc: the type of processContents
 *
 * Returns a string representation of the type of
 * processContents.
 */
static const xmlChar *
xmlSchemaWildcardPCToString(int pc)
{
    switch (pc) {
	case XML_SCHEMAS_ANY_SKIP:
	    return (BAD_CAST "skip");
	case XML_SCHEMAS_ANY_LAX:
	    return (BAD_CAST "lax");
	case XML_SCHEMAS_ANY_STRICT:
	    return (BAD_CAST "strict");
	default:
	    return (BAD_CAST "invalid process contents");
    }
}

/**
 * xmlSchemaGetCanonValueWhtspExt:
 * @val: the precomputed value
 * @retValue: the returned value
 * @ws: the whitespace type of the value
 *
 * Get a the cononical representation of the value.
 * The caller has to free the returned retValue.
 *
 * Returns 0 if the value could be built and -1 in case of
 *         API errors or if the value type is not supported yet.
 */
static int
xmlSchemaGetCanonValueWhtspExt(xmlSchemaValPtr val,
			       xmlSchemaWhitespaceValueType ws,
			       xmlChar **retValue)
{
    int list;
    xmlSchemaValType valType;
    const xmlChar *value, *value2 = NULL;


    if ((retValue == NULL) || (val == NULL))
	return (-1);
    list = xmlSchemaValueGetNext(val) ? 1 : 0;
    *retValue = NULL;
    do {
	value = NULL;
	valType = xmlSchemaGetValType(val);
	switch (valType) {
	    case XML_SCHEMAS_STRING:
	    case XML_SCHEMAS_NORMSTRING:
	    case XML_SCHEMAS_ANYSIMPLETYPE:
		value = xmlSchemaValueGetAsString(val);
		if (value != NULL) {
		    if (ws == XML_SCHEMA_WHITESPACE_COLLAPSE)
			value2 = xmlSchemaCollapseString(value);
		    else if (ws == XML_SCHEMA_WHITESPACE_REPLACE)
			value2 = xmlSchemaWhiteSpaceReplace(value);
		    if (value2 != NULL)
			value = value2;
		}
		break;
	    default:
		if (xmlSchemaGetCanonValue(val, &value2) == -1) {
		    if (value2 != NULL)
			xmlFree((xmlChar *) value2);
		    goto internal_error;
		}
		value = value2;
	}
	if (*retValue == NULL)
	    if (value == NULL) {
		if (! list)
		    *retValue = xmlStrdup(BAD_CAST "");
	    } else
		*retValue = xmlStrdup(value);
	else if (value != NULL) {
	    /* List. */
	    *retValue = xmlStrcat((xmlChar *) *retValue, BAD_CAST " ");
	    *retValue = xmlStrcat((xmlChar *) *retValue, value);
	}
	FREE_AND_NULL(value2)
	val = xmlSchemaValueGetNext(val);
    } while (val != NULL);

    return (0);
internal_error:
    if (*retValue != NULL)
	xmlFree((xmlChar *) (*retValue));
    if (value2 != NULL)
	xmlFree((xmlChar *) value2);
    return (-1);
}

/**
 * xmlSchemaFormatItemForReport:
 * @buf: the string buffer
 * @itemDes: the designation of the item
 * @itemName: the name of the item
 * @item: the item as an object
 * @itemNode: the node of the item
 * @local: the local name
 * @parsing: if the function is used during the parse
 *
 * Returns a representation of the given item used
 * for error reports.
 *
 * The following order is used to build the resulting
 * designation if the arguments are not NULL:
 * 1a. If itemDes not NULL -> itemDes
 * 1b. If (itemDes not NULL) and (itemName not NULL)
 *     -> itemDes + itemName
 * 2. If the preceding was NULL and (item not NULL) -> item
 * 3. If the preceding was NULL and (itemNode not NULL) -> itemNode
 *
 * If the itemNode is an attribute node, the name of the attribute
 * will be appended to the result.
 *
 * Returns the formatted string and sets @buf to the resulting value.
 */
static xmlChar*
xmlSchemaFormatItemForReport(xmlChar **buf,
		     const xmlChar *itemDes,
		     xmlSchemaBasicItemPtr item,
		     xmlNodePtr itemNode)
{
    xmlChar *str = NULL;
    int named = 1;

    if (*buf != NULL) {
	xmlFree(*buf);
	*buf = NULL;
    }

    if (itemDes != NULL) {
	*buf = xmlStrdup(itemDes);
    } else if (item != NULL) {
	switch (item->type) {
	case XML_SCHEMA_TYPE_BASIC: {
	    xmlSchemaTypePtr type = WXS_TYPE_CAST item;

	    if (WXS_IS_ATOMIC(type))
		*buf = xmlStrdup(BAD_CAST "atomic type 'xs:");
	    else if (WXS_IS_LIST(type))
		*buf = xmlStrdup(BAD_CAST "list type 'xs:");
	    else if (WXS_IS_UNION(type))
		*buf = xmlStrdup(BAD_CAST "union type 'xs:");
	    else
		*buf = xmlStrdup(BAD_CAST "simple type 'xs:");
	    *buf = xmlStrcat(*buf, type->name);
	    *buf = xmlStrcat(*buf, BAD_CAST "'");
	    }
	    break;
	case XML_SCHEMA_TYPE_SIMPLE: {
	    xmlSchemaTypePtr type = WXS_TYPE_CAST item;

	    if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
		*buf = xmlStrdup(BAD_CAST"");
	    } else {
		*buf = xmlStrdup(BAD_CAST "local ");
	    }
	    if (WXS_IS_ATOMIC(type))
		*buf = xmlStrcat(*buf, BAD_CAST "atomic type");
	    else if (WXS_IS_LIST(type))
		*buf = xmlStrcat(*buf, BAD_CAST "list type");
	    else if (WXS_IS_UNION(type))
		*buf = xmlStrcat(*buf, BAD_CAST "union type");
	    else
		*buf = xmlStrcat(*buf, BAD_CAST "simple type");
	    if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, type->name);
		*buf = xmlStrcat(*buf, BAD_CAST "'");
	    }
	    }
	    break;
	case XML_SCHEMA_TYPE_COMPLEX: {
	    xmlSchemaTypePtr type = WXS_TYPE_CAST item;

	    if (type->flags & XML_SCHEMAS_TYPE_GLOBAL)
		*buf = xmlStrdup(BAD_CAST "");
	    else
		*buf = xmlStrdup(BAD_CAST "local ");
	    *buf = xmlStrcat(*buf, BAD_CAST "complex type");
	    if (type->flags & XML_SCHEMAS_TYPE_GLOBAL) {
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, type->name);
		*buf = xmlStrcat(*buf, BAD_CAST "'");
	    }
	    }
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTE_USE: {
		xmlSchemaAttributeUsePtr ause;

		ause = WXS_ATTR_USE_CAST item;
		*buf = xmlStrdup(BAD_CAST "attribute use ");
		if (WXS_ATTRUSE_DECL(ause) != NULL) {
		    *buf = xmlStrcat(*buf, BAD_CAST "'");
		    *buf = xmlStrcat(*buf,
			xmlSchemaGetComponentQName(&str, WXS_ATTRUSE_DECL(ause)));
		    FREE_AND_NULL(str)
			*buf = xmlStrcat(*buf, BAD_CAST "'");
		} else {
		    *buf = xmlStrcat(*buf, BAD_CAST "(unknown)");
		}
	    }
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTE: {
		xmlSchemaAttributePtr attr;

		attr = (xmlSchemaAttributePtr) item;
		*buf = xmlStrdup(BAD_CAST "attribute decl.");
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
		    attr->targetNamespace, attr->name));
		FREE_AND_NULL(str)
		    *buf = xmlStrcat(*buf, BAD_CAST "'");
	    }
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
	    xmlSchemaGetComponentDesignation(buf, item);
	    break;
	case XML_SCHEMA_TYPE_ELEMENT: {
		xmlSchemaElementPtr elem;

		elem = (xmlSchemaElementPtr) item;
		*buf = xmlStrdup(BAD_CAST "element decl.");
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
		    elem->targetNamespace, elem->name));
		*buf = xmlStrcat(*buf, BAD_CAST "'");
	    }
	    break;
	case XML_SCHEMA_TYPE_IDC_UNIQUE:
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	    if (item->type == XML_SCHEMA_TYPE_IDC_UNIQUE)
		*buf = xmlStrdup(BAD_CAST "unique '");
	    else if (item->type == XML_SCHEMA_TYPE_IDC_KEY)
		*buf = xmlStrdup(BAD_CAST "key '");
	    else
		*buf = xmlStrdup(BAD_CAST "keyRef '");
	    *buf = xmlStrcat(*buf, ((xmlSchemaIDCPtr) item)->name);
	    *buf = xmlStrcat(*buf, BAD_CAST "'");
	    break;
	case XML_SCHEMA_TYPE_ANY:
	case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
	    *buf = xmlStrdup(xmlSchemaWildcardPCToString(
		    ((xmlSchemaWildcardPtr) item)->processContents));
	    *buf = xmlStrcat(*buf, BAD_CAST " wildcard");
	    break;
	case XML_SCHEMA_FACET_MININCLUSIVE:
	case XML_SCHEMA_FACET_MINEXCLUSIVE:
	case XML_SCHEMA_FACET_MAXINCLUSIVE:
	case XML_SCHEMA_FACET_MAXEXCLUSIVE:
	case XML_SCHEMA_FACET_TOTALDIGITS:
	case XML_SCHEMA_FACET_FRACTIONDIGITS:
	case XML_SCHEMA_FACET_PATTERN:
	case XML_SCHEMA_FACET_ENUMERATION:
	case XML_SCHEMA_FACET_WHITESPACE:
	case XML_SCHEMA_FACET_LENGTH:
	case XML_SCHEMA_FACET_MAXLENGTH:
	case XML_SCHEMA_FACET_MINLENGTH:
	    *buf = xmlStrdup(BAD_CAST "facet '");
	    *buf = xmlStrcat(*buf, xmlSchemaFacetTypeToString(item->type));
	    *buf = xmlStrcat(*buf, BAD_CAST "'");
	    break;
	case XML_SCHEMA_TYPE_GROUP: {
		*buf = xmlStrdup(BAD_CAST "model group def.");
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str, item));
		*buf = xmlStrcat(*buf, BAD_CAST "'");
		FREE_AND_NULL(str)
	    }
	    break;
	case XML_SCHEMA_TYPE_SEQUENCE:
	case XML_SCHEMA_TYPE_CHOICE:
	case XML_SCHEMA_TYPE_ALL:
	case XML_SCHEMA_TYPE_PARTICLE:
	    *buf = xmlStrdup(WXS_ITEM_TYPE_NAME(item));
	    break;
	case XML_SCHEMA_TYPE_NOTATION: {
		*buf = xmlStrdup(WXS_ITEM_TYPE_NAME(item));
		*buf = xmlStrcat(*buf, BAD_CAST " '");
		*buf = xmlStrcat(*buf, xmlSchemaGetComponentQName(&str, item));
		*buf = xmlStrcat(*buf, BAD_CAST "'");
		FREE_AND_NULL(str);
	    }
	default:
	    named = 0;
	}
    } else
	named = 0;

    if ((named == 0) && (itemNode != NULL)) {
	xmlNodePtr elem;

	if (itemNode->type == XML_ATTRIBUTE_NODE)
	    elem = itemNode->parent;
	else
	    elem = itemNode;
	*buf = xmlStrdup(BAD_CAST "Element '");
	if (elem->ns != NULL) {
	    *buf = xmlStrcat(*buf,
		xmlSchemaFormatQName(&str, elem->ns->href, elem->name));
	    FREE_AND_NULL(str)
	} else
	    *buf = xmlStrcat(*buf, elem->name);
	*buf = xmlStrcat(*buf, BAD_CAST "'");

    }
    if ((itemNode != NULL) && (itemNode->type == XML_ATTRIBUTE_NODE)) {
	*buf = xmlStrcat(*buf, BAD_CAST ", attribute '");
	if (itemNode->ns != NULL) {
	    *buf = xmlStrcat(*buf, xmlSchemaFormatQName(&str,
		itemNode->ns->href, itemNode->name));
	    FREE_AND_NULL(str)
	} else
	    *buf = xmlStrcat(*buf, itemNode->name);
	*buf = xmlStrcat(*buf, BAD_CAST "'");
    }
    FREE_AND_NULL(str)

    return (*buf);
}

/**
 * xmlSchemaFormatFacetEnumSet:
 * @buf: the string buffer
 * @type: the type holding the enumeration facets
 *
 * Builds a string consisting of all enumeration elements.
 *
 * Returns a string of all enumeration elements.
 */
static const xmlChar *
xmlSchemaFormatFacetEnumSet(xmlSchemaAbstractCtxtPtr actxt,
			    xmlChar **buf, xmlSchemaTypePtr type)
{
    xmlSchemaFacetPtr facet;
    xmlSchemaWhitespaceValueType ws;
    xmlChar *value = NULL;
    int res, found = 0;

    if (*buf != NULL)
	xmlFree(*buf);
    *buf = NULL;

    do {
	/*
	* Use the whitespace type of the base type.
	*/
	ws = xmlSchemaGetWhiteSpaceFacetValue(type->baseType);
	for (facet = type->facets; facet != NULL; facet = facet->next) {
	    if (facet->type != XML_SCHEMA_FACET_ENUMERATION)
		continue;
	    found = 1;
	    res = xmlSchemaGetCanonValueWhtspExt(facet->val,
		ws, &value);
	    if (res == -1) {
		xmlSchemaInternalErr(actxt,
		    "xmlSchemaFormatFacetEnumSet",
		    "compute the canonical lexical representation");
		if (*buf != NULL)
		    xmlFree(*buf);
		*buf = NULL;
		return (NULL);
	    }
	    if (*buf == NULL)
		*buf = xmlStrdup(BAD_CAST "'");
	    else
		*buf = xmlStrcat(*buf, BAD_CAST ", '");
	    *buf = xmlStrcat(*buf, BAD_CAST value);
	    *buf = xmlStrcat(*buf, BAD_CAST "'");
	    if (value != NULL) {
		xmlFree((xmlChar *)value);
		value = NULL;
	    }
	}
	/*
	* The enumeration facet of a type restricts the enumeration
	* facet of the ancestor type; i.e., such restricted enumerations
	* do not belong to the set of the given type. Thus we break
	* on the first found enumeration.
	*/
	if (found)
	    break;
	type = type->baseType;
    } while ((type != NULL) && (type->type != XML_SCHEMA_TYPE_BASIC));

    return ((const xmlChar *) *buf);
}

/************************************************************************
 *									*
 * 			Error functions				        *
 *									*
 ************************************************************************/

#if 0
static void
xmlSchemaErrMemory(const char *msg)
{
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, NULL, NULL,
                     msg);
}
#endif

static void
xmlSchemaPSimpleErr(const char *msg)
{
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, NULL, NULL,
                     msg);
}

/**
 * xmlSchemaPErrMemory:
 * @node: a context node
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlSchemaPErrMemory(xmlSchemaParserCtxtPtr ctxt,
                    const char *extra, xmlNodePtr node)
{
    if (ctxt != NULL)
        ctxt->nberrors++;
    __xmlSimpleError(XML_FROM_SCHEMASP, XML_ERR_NO_MEMORY, node, NULL,
                     extra);
}

/**
 * xmlSchemaPErr:
 * @ctxt: the parsing context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 *
 * Handle a parser error
 */
static void
xmlSchemaPErr(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int error,
              const char *msg, const xmlChar * str1, const xmlChar * str2)
{
    xmlGenericErrorFunc channel = NULL;
    xmlStructuredErrorFunc schannel = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        ctxt->nberrors++;
	ctxt->err = error;
        channel = ctxt->error;
        data = ctxt->errCtxt;
	schannel = ctxt->serror;
    }
    __xmlRaiseError(schannel, channel, data, ctxt, node, XML_FROM_SCHEMASP,
                    error, XML_ERR_ERROR, NULL, 0,
                    (const char *) str1, (const char *) str2, NULL, 0, 0,
                    msg, str1, str2);
}

/**
 * xmlSchemaPErr2:
 * @ctxt: the parsing context
 * @node: the context node
 * @node: the current child
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 *
 * Handle a parser error
 */
static void
xmlSchemaPErr2(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
               xmlNodePtr child, int error,
               const char *msg, const xmlChar * str1, const xmlChar * str2)
{
    if (child != NULL)
        xmlSchemaPErr(ctxt, child, error, msg, str1, str2);
    else
        xmlSchemaPErr(ctxt, node, error, msg, str1, str2);
}


/**
 * xmlSchemaPErrExt:
 * @ctxt: the parsing context
 * @node: the context node
 * @error: the error code
 * @strData1: extra data
 * @strData2: extra data
 * @strData3: extra data
 * @msg: the message
 * @str1:  extra parameter for the message display
 * @str2:  extra parameter for the message display
 * @str3:  extra parameter for the message display
 * @str4:  extra parameter for the message display
 * @str5:  extra parameter for the message display
 *
 * Handle a parser error
 */
static void
xmlSchemaPErrExt(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int error,
		const xmlChar * strData1, const xmlChar * strData2,
		const xmlChar * strData3, const char *msg, const xmlChar * str1,
		const xmlChar * str2, const xmlChar * str3, const xmlChar * str4,
		const xmlChar * str5)
{

    xmlGenericErrorFunc channel = NULL;
    xmlStructuredErrorFunc schannel = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
        ctxt->nberrors++;
	ctxt->err = error;
        channel = ctxt->error;
        data = ctxt->errCtxt;
	schannel = ctxt->serror;
    }
    __xmlRaiseError(schannel, channel, data, ctxt, node, XML_FROM_SCHEMASP,
                    error, XML_ERR_ERROR, NULL, 0,
                    (const char *) strData1, (const char *) strData2,
		    (const char *) strData3, 0, 0, msg, str1, str2,
		    str3, str4, str5);
}

/************************************************************************
 *									*
 * 			Allround error functions			*
 *									*
 ************************************************************************/

/**
 * xmlSchemaVTypeErrMemory:
 * @node: a context node
 * @extra:  extra informations
 *
 * Handle an out of memory condition
 */
static void
xmlSchemaVErrMemory(xmlSchemaValidCtxtPtr ctxt,
                    const char *extra, xmlNodePtr node)
{
    if (ctxt != NULL) {
        ctxt->nberrors++;
        ctxt->err = XML_SCHEMAV_INTERNAL;
    }
    __xmlSimpleError(XML_FROM_SCHEMASV, XML_ERR_NO_MEMORY, node, NULL,
                     extra);
}

static void
xmlSchemaPSimpleInternalErr(xmlNodePtr node,
			    const char *msg, const xmlChar *str)
{
     __xmlSimpleError(XML_FROM_SCHEMASP, XML_SCHEMAP_INTERNAL, node,
	 msg, (const char *) str);
}

#define WXS_ERROR_TYPE_ERROR 1
#define WXS_ERROR_TYPE_WARNING 2
/**
 * xmlSchemaErr3:
 * @ctxt: the validation context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * @str3: extra data
 *
 * Handle a validation error
 */
static void
xmlSchemaErr4Line(xmlSchemaAbstractCtxtPtr ctxt,
		  xmlErrorLevel errorLevel,
		  int error, xmlNodePtr node, int line, const char *msg,
		  const xmlChar *str1, const xmlChar *str2,
		  const xmlChar *str3, const xmlChar *str4)
{
    xmlStructuredErrorFunc schannel = NULL;
    xmlGenericErrorFunc channel = NULL;
    void *data = NULL;

    if (ctxt != NULL) {
	if (ctxt->type == XML_SCHEMA_CTXT_VALIDATOR) {
	    xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) ctxt;
	    const char *file = NULL;
	    if (errorLevel != XML_ERR_WARNING) {
		vctxt->nberrors++;
		vctxt->err = error;
		channel = vctxt->error;
	    } else {
		channel = vctxt->warning;
	    }
	    schannel = vctxt->serror;
	    data = vctxt->errCtxt;

	    /*
	    * Error node. If we specify a line number, then
	    * do not channel any node to the error function.
	    */
	    if (line == 0) {
		if ((node == NULL) &&
		    (vctxt->depth >= 0) &&
		    (vctxt->inode != NULL)) {
		    node = vctxt->inode->node;
		}
		/*
		* Get filename and line if no node-tree.
		*/
		if ((node == NULL) &&
		    (vctxt->parserCtxt != NULL) &&
		    (vctxt->parserCtxt->input != NULL)) {
		    file = vctxt->parserCtxt->input->filename;
		    line = vctxt->parserCtxt->input->line;
		}
	    } else {
		/*
		* Override the given node's (if any) position
		* and channel only the given line number.
		*/
		node = NULL;
		/*
		* Get filename.
		*/
		if (vctxt->doc != NULL)
		    file = (const char *) vctxt->doc->URL;
		else if ((vctxt->parserCtxt != NULL) &&
		    (vctxt->parserCtxt->input != NULL))
		    file = vctxt->parserCtxt->input->filename;
	    }
	    __xmlRaiseError(schannel, channel, data, ctxt,
		node, XML_FROM_SCHEMASV,
		error, errorLevel, file, line,
		(const char *) str1, (const char *) str2,
		(const char *) str3, 0, 0, msg, str1, str2, str3, str4);

	} else if (ctxt->type == XML_SCHEMA_CTXT_PARSER) {
	    xmlSchemaParserCtxtPtr pctxt = (xmlSchemaParserCtxtPtr) ctxt;
	    if (errorLevel != XML_ERR_WARNING) {
		pctxt->nberrors++;
		pctxt->err = error;
		channel = pctxt->error;
	    } else {
		channel = pctxt->warning;
	    }
	    schannel = pctxt->serror;
	    data = pctxt->errCtxt;
	    __xmlRaiseError(schannel, channel, data, ctxt,
		node, XML_FROM_SCHEMASP, error,
		errorLevel, NULL, 0,
		(const char *) str1, (const char *) str2,
		(const char *) str3, 0, 0, msg, str1, str2, str3, str4);
	} else {
	    TODO
	}
    }
}

/**
 * xmlSchemaErr3:
 * @ctxt: the validation context
 * @node: the context node
 * @error: the error code
 * @msg: the error message
 * @str1: extra data
 * @str2: extra data
 * @str3: extra data
 *
 * Handle a validation error
 */
static void
xmlSchemaErr3(xmlSchemaAbstractCtxtPtr actxt,
	      int error, xmlNodePtr node, const char *msg,
	      const xmlChar *str1, const xmlChar *str2, const xmlChar *str3)
{
    xmlSchemaErr4Line(actxt, XML_ERR_ERROR, error, node, 0,
	msg, str1, str2, str3, NULL);
}

static void
xmlSchemaErr4(xmlSchemaAbstractCtxtPtr actxt,
	      int error, xmlNodePtr node, const char *msg,
	      const xmlChar *str1, const xmlChar *str2,
	      const xmlChar *str3, const xmlChar *str4)
{
    xmlSchemaErr4Line(actxt, XML_ERR_ERROR, error, node, 0,
	msg, str1, str2, str3, str4);
}

static void
xmlSchemaErr(xmlSchemaAbstractCtxtPtr actxt,
	     int error, xmlNodePtr node, const char *msg,
	     const xmlChar *str1, const xmlChar *str2)
{
    xmlSchemaErr4(actxt, error, node, msg, str1, str2, NULL, NULL);
}

static xmlChar *
xmlSchemaFormatNodeForError(xmlChar ** msg,
			    xmlSchemaAbstractCtxtPtr actxt,
			    xmlNodePtr node)
{
    xmlChar *str = NULL;

    *msg = NULL;
    if ((node != NULL) &&
	(node->type != XML_ELEMENT_NODE) &&
	(node->type != XML_ATTRIBUTE_NODE))
    {
	/*
	* Don't try to format other nodes than element and
	* attribute nodes.
	* Play save and return an empty string.
	*/
	*msg = xmlStrdup(BAD_CAST "");
	return(*msg);
    }
    if (node != NULL) {
	/*
	* Work on tree nodes.
	*/
	if (node->type == XML_ATTRIBUTE_NODE) {
	    xmlNodePtr elem = node->parent;

	    *msg = xmlStrdup(BAD_CAST "Element '");
	    if (elem->ns != NULL)
		*msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
		    elem->ns->href, elem->name));
	    else
		*msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
		    NULL, elem->name));
	    FREE_AND_NULL(str);
	    *msg = xmlStrcat(*msg, BAD_CAST "', ");
	    *msg = xmlStrcat(*msg, BAD_CAST "attribute '");
	} else {
	    *msg = xmlStrdup(BAD_CAST "Element '");
	}
	if (node->ns != NULL)
	    *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
	    node->ns->href, node->name));
	else
	    *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
	    NULL, node->name));
	FREE_AND_NULL(str);
	*msg = xmlStrcat(*msg, BAD_CAST "': ");
    } else if (actxt->type == XML_SCHEMA_CTXT_VALIDATOR) {
	xmlSchemaValidCtxtPtr vctxt = (xmlSchemaValidCtxtPtr) actxt;
	/*
	* Work on node infos.
	*/
	if (vctxt->inode->nodeType == XML_ATTRIBUTE_NODE) {
	    xmlSchemaNodeInfoPtr ielem =
		vctxt->elemInfos[vctxt->depth];

	    *msg = xmlStrdup(BAD_CAST "Element '");
	    *msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
		ielem->nsName, ielem->localName));
	    FREE_AND_NULL(str);
	    *msg = xmlStrcat(*msg, BAD_CAST "', ");
	    *msg = xmlStrcat(*msg, BAD_CAST "attribute '");
	} else {
	    *msg = xmlStrdup(BAD_CAST "Element '");
	}
	*msg = xmlStrcat(*msg, xmlSchemaFormatQName(&str,
	    vctxt->inode->nsName, vctxt->inode->localName));
	FREE_AND_NULL(str);
	*msg = xmlStrcat(*msg, BAD_CAST "': ");
    } else if (actxt->type == XML_SCHEMA_CTXT_PARSER) {
	/*
	* Hmm, no node while parsing?
	* Return an empty string, in case NULL will break something.
	*/
	*msg = xmlStrdup(BAD_CAST "");
    } else {
	TODO
	return (NULL);
    }
    /*
    * VAL TODO: The output of the given schema component is currently
    * disabled.
    */
#if 0
    if ((type != NULL) && (xmlSchemaIsGlobalItem(type))) {
	*msg = xmlStrcat(*msg, BAD_CAST " [");
	*msg = xmlStrcat(*msg, xmlSchemaFormatItemForReport(&str,
	    NULL, type, NULL, 0));
	FREE_AND_NULL(str)
	*msg = xmlStrcat(*msg, BAD_CAST "]");
    }
#endif
    return (*msg);
}

static void
xmlSchemaInternalErr2(xmlSchemaAbstractCtxtPtr actxt,
		     const char *funcName,
		     const char *message,
		     const xmlChar *str1,
		     const xmlChar *str2)
{
    xmlChar *msg = NULL;

    if (actxt == NULL)
        return;
    msg = xmlStrdup(BAD_CAST "Internal error: ");
    msg = xmlStrcat(msg, BAD_CAST funcName);
    msg = xmlStrcat(msg, BAD_CAST ", ");
    msg = xmlStrcat(msg, BAD_CAST message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");

    if (actxt->type == XML_SCHEMA_CTXT_VALIDATOR)
	xmlSchemaErr(actxt, XML_SCHEMAV_INTERNAL, NULL,
	    (const char *) msg, str1, str2);

    else if (actxt->type == XML_SCHEMA_CTXT_PARSER)
	xmlSchemaErr(actxt, XML_SCHEMAP_INTERNAL, NULL,
	    (const char *) msg, str1, str2);

    FREE_AND_NULL(msg)
}

static void
xmlSchemaInternalErr(xmlSchemaAbstractCtxtPtr actxt,
		     const char *funcName,
		     const char *message)
{
    xmlSchemaInternalErr2(actxt, funcName, message, NULL, NULL);
}

#if 0
static void
xmlSchemaPInternalErr(xmlSchemaParserCtxtPtr pctxt,
		     const char *funcName,
		     const char *message,
		     const xmlChar *str1,
		     const xmlChar *str2)
{
    xmlSchemaInternalErr2(ACTXT_CAST pctxt, funcName, message,
	str1, str2);
}
#endif

static void
xmlSchemaCustomErr4(xmlSchemaAbstractCtxtPtr actxt,
		   xmlParserErrors error,
		   xmlNodePtr node,
		   xmlSchemaBasicItemPtr item,
		   const char *message,
		   const xmlChar *str1, const xmlChar *str2,
		   const xmlChar *str3, const xmlChar *str4)
{
    xmlChar *msg = NULL;

    if ((node == NULL) && (item != NULL) &&
	(actxt->type == XML_SCHEMA_CTXT_PARSER)) {
	node = WXS_ITEM_NODE(item);
	xmlSchemaFormatItemForReport(&msg, NULL, item, NULL);
	msg = xmlStrcat(msg, BAD_CAST ": ");
    } else
	xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    xmlSchemaErr4(actxt, error, node,
	(const char *) msg, str1, str2, str3, str4);
    FREE_AND_NULL(msg)
}

static void
xmlSchemaCustomErr(xmlSchemaAbstractCtxtPtr actxt,
		   xmlParserErrors error,
		   xmlNodePtr node,
		   xmlSchemaBasicItemPtr item,
		   const char *message,
		   const xmlChar *str1,
		   const xmlChar *str2)
{
    xmlSchemaCustomErr4(actxt, error, node, item,
	message, str1, str2, NULL, NULL);
}



static void
xmlSchemaCustomWarning(xmlSchemaAbstractCtxtPtr actxt,
		   xmlParserErrors error,
		   xmlNodePtr node,
		   xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
		   const char *message,
		   const xmlChar *str1,
		   const xmlChar *str2,
		   const xmlChar *str3)
{
    xmlChar *msg = NULL;

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");

    /* URGENT TODO: Set the error code to something sane. */
    xmlSchemaErr4Line(actxt, XML_ERR_WARNING, error, node, 0,
	(const char *) msg, str1, str2, str3, NULL);

    FREE_AND_NULL(msg)
}



static void
xmlSchemaKeyrefErr(xmlSchemaValidCtxtPtr vctxt,
		   xmlParserErrors error,
		   xmlSchemaPSVIIDCNodePtr idcNode,
		   xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
		   const char *message,
		   const xmlChar *str1,
		   const xmlChar *str2)
{
    xmlChar *msg = NULL, *qname = NULL;

    msg = xmlStrdup(BAD_CAST "Element '%s': ");
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    xmlSchemaErr4Line(ACTXT_CAST vctxt, XML_ERR_ERROR,
	error, NULL, idcNode->nodeLine, (const char *) msg,
	xmlSchemaFormatQName(&qname,
	    vctxt->nodeQNames->items[idcNode->nodeQNameID +1],
	    vctxt->nodeQNames->items[idcNode->nodeQNameID]),
	str1, str2, NULL);
    FREE_AND_NULL(qname);
    FREE_AND_NULL(msg);
}

static int
xmlSchemaEvalErrorNodeType(xmlSchemaAbstractCtxtPtr actxt,
			   xmlNodePtr node)
{
    if (node != NULL)
	return (node->type);
    if ((actxt->type == XML_SCHEMA_CTXT_VALIDATOR) &&
	(((xmlSchemaValidCtxtPtr) actxt)->inode != NULL))
	return ( ((xmlSchemaValidCtxtPtr) actxt)->inode->nodeType);
    return (-1);
}

static int
xmlSchemaIsGlobalItem(xmlSchemaTypePtr item)
{
    switch (item->type) {
	case XML_SCHEMA_TYPE_COMPLEX:
	case XML_SCHEMA_TYPE_SIMPLE:
	    if (item->flags & XML_SCHEMAS_TYPE_GLOBAL)
		return(1);
	    break;
	case XML_SCHEMA_TYPE_GROUP:
	    return (1);
	case XML_SCHEMA_TYPE_ELEMENT:
	    if ( ((xmlSchemaElementPtr) item)->flags &
		XML_SCHEMAS_ELEM_GLOBAL)
		return(1);
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTE:
	    if ( ((xmlSchemaAttributePtr) item)->flags &
		XML_SCHEMAS_ATTR_GLOBAL)
		return(1);
	    break;
	/* Note that attribute groups are always global. */
	default:
	    return(1);
    }
    return (0);
}

static void
xmlSchemaSimpleTypeErr(xmlSchemaAbstractCtxtPtr actxt,
		       xmlParserErrors error,
		       xmlNodePtr node,
		       const xmlChar *value,
		       xmlSchemaTypePtr type,
		       int displayValue)
{
    xmlChar *msg = NULL;

    xmlSchemaFormatNodeForError(&msg, actxt, node);

    if (displayValue || (xmlSchemaEvalErrorNodeType(actxt, node) ==
	    XML_ATTRIBUTE_NODE))
	msg = xmlStrcat(msg, BAD_CAST "'%s' is not a valid value of ");
    else
	msg = xmlStrcat(msg, BAD_CAST "The character content is not a valid "
	    "value of ");

    if (! xmlSchemaIsGlobalItem(type))
	msg = xmlStrcat(msg, BAD_CAST "the local ");
    else
	msg = xmlStrcat(msg, BAD_CAST "the ");

    if (WXS_IS_ATOMIC(type))
	msg = xmlStrcat(msg, BAD_CAST "atomic type");
    else if (WXS_IS_LIST(type))
	msg = xmlStrcat(msg, BAD_CAST "list type");
    else if (WXS_IS_UNION(type))
	msg = xmlStrcat(msg, BAD_CAST "union type");

    if (xmlSchemaIsGlobalItem(type)) {
	xmlChar *str = NULL;
	msg = xmlStrcat(msg, BAD_CAST " '");
	if (type->builtInType != 0) {
	    msg = xmlStrcat(msg, BAD_CAST "xs:");
	    msg = xmlStrcat(msg, type->name);
	} else
	    msg = xmlStrcat(msg,
		xmlSchemaFormatQName(&str,
		    type->targetNamespace, type->name));
	msg = xmlStrcat(msg, BAD_CAST "'");
	FREE_AND_NULL(str);
    }
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    if (displayValue || (xmlSchemaEvalErrorNodeType(actxt, node) ==
	    XML_ATTRIBUTE_NODE))
	xmlSchemaErr(actxt, error, node, (const char *) msg, value, NULL);
    else
	xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
    FREE_AND_NULL(msg)
}

static const xmlChar *
xmlSchemaFormatErrorNodeQName(xmlChar ** str,
			      xmlSchemaNodeInfoPtr ni,
			      xmlNodePtr node)
{
    if (node != NULL) {
	if (node->ns != NULL)
	    return (xmlSchemaFormatQName(str, node->ns->href, node->name));
	else
	    return (xmlSchemaFormatQName(str, NULL, node->name));
    } else if (ni != NULL)
	return (xmlSchemaFormatQName(str, ni->nsName, ni->localName));
    return (NULL);
}

static void
xmlSchemaIllegalAttrErr(xmlSchemaAbstractCtxtPtr actxt,
			xmlParserErrors error,
			xmlSchemaAttrInfoPtr ni,
			xmlNodePtr node)
{
    xmlChar *msg = NULL, *str = NULL;

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, BAD_CAST "The attribute '%s' is not allowed.\n");
    xmlSchemaErr(actxt, error, node, (const char *) msg,
	xmlSchemaFormatErrorNodeQName(&str, (xmlSchemaNodeInfoPtr) ni, node),
	NULL);
    FREE_AND_NULL(str)
    FREE_AND_NULL(msg)
}

static void
xmlSchemaComplexTypeErr(xmlSchemaAbstractCtxtPtr actxt,
		        xmlParserErrors error,
		        xmlNodePtr node,
			xmlSchemaTypePtr type ATTRIBUTE_UNUSED,
			const char *message,
			int nbval,
			int nbneg,
			xmlChar **values)
{
    xmlChar *str = NULL, *msg = NULL;
    xmlChar *localName, *nsName;
    const xmlChar *cur, *end;
    int i;

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".");
    /*
    * Note that is does not make sense to report that we have a
    * wildcard here, since the wildcard might be unfolded into
    * multiple transitions.
    */
    if (nbval + nbneg > 0) {
	if (nbval + nbneg > 1) {
	    str = xmlStrdup(BAD_CAST " Expected is one of ( ");
	} else
	    str = xmlStrdup(BAD_CAST " Expected is ( ");
	nsName = NULL;

	for (i = 0; i < nbval + nbneg; i++) {
	    cur = values[i];
	    if (cur == NULL)
	        continue;
	    if ((cur[0] == 'n') && (cur[1] == 'o') && (cur[2] == 't') &&
	        (cur[3] == ' ')) {
		cur += 4;
		str = xmlStrcat(str, BAD_CAST "##other");
	    }
	    /*
	    * Get the local name.
	    */
	    localName = NULL;

	    end = cur;
	    if (*end == '*') {
		localName = xmlStrdup(BAD_CAST "*");
		end++;
	    } else {
		while ((*end != 0) && (*end != '|'))
		    end++;
		localName = xmlStrncat(localName, BAD_CAST cur, end - cur);
	    }
	    if (*end != 0) {
		end++;
		/*
		* Skip "*|*" if they come with negated expressions, since
		* they represent the same negated wildcard.
		*/
		if ((nbneg == 0) || (*end != '*') || (*localName != '*')) {
		    /*
		    * Get the namespace name.
		    */
		    cur = end;
		    if (*end == '*') {
			nsName = xmlStrdup(BAD_CAST "{*}");
		    } else {
			while (*end != 0)
			    end++;

			if (i >= nbval)
			    nsName = xmlStrdup(BAD_CAST "{##other:");
			else
			    nsName = xmlStrdup(BAD_CAST "{");

			nsName = xmlStrncat(nsName, BAD_CAST cur, end - cur);
			nsName = xmlStrcat(nsName, BAD_CAST "}");
		    }
		    str = xmlStrcat(str, BAD_CAST nsName);
		    FREE_AND_NULL(nsName)
		} else {
		    FREE_AND_NULL(localName);
		    continue;
		}
	    }
	    str = xmlStrcat(str, BAD_CAST localName);
	    FREE_AND_NULL(localName);

	    if (i < nbval + nbneg -1)
		str = xmlStrcat(str, BAD_CAST ", ");
	}
	str = xmlStrcat(str, BAD_CAST " ).\n");
	msg = xmlStrcat(msg, BAD_CAST str);
	FREE_AND_NULL(str)
    } else
      msg = xmlStrcat(msg, BAD_CAST "\n");
    xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
    xmlFree(msg);
}

static void
xmlSchemaFacetErr(xmlSchemaAbstractCtxtPtr actxt,
		  xmlParserErrors error,
		  xmlNodePtr node,
		  const xmlChar *value,
		  unsigned long length,
		  xmlSchemaTypePtr type,
		  xmlSchemaFacetPtr facet,
		  const char *message,
		  const xmlChar *str1,
		  const xmlChar *str2)
{
    xmlChar *str = NULL, *msg = NULL;
    xmlSchemaTypeType facetType;
    int nodeType = xmlSchemaEvalErrorNodeType(actxt, node);

    xmlSchemaFormatNodeForError(&msg, actxt, node);
    if (error == XML_SCHEMAV_CVC_ENUMERATION_VALID) {
	facetType = XML_SCHEMA_FACET_ENUMERATION;
	/*
	* If enumerations are validated, one must not expect the
	* facet to be given.
	*/
    } else
	facetType = facet->type;
    msg = xmlStrcat(msg, BAD_CAST "[");
    msg = xmlStrcat(msg, BAD_CAST "facet '");
    msg = xmlStrcat(msg, xmlSchemaFacetTypeToString(facetType));
    msg = xmlStrcat(msg, BAD_CAST "'] ");
    if (message == NULL) {
	/*
	* Use a default message.
	*/
	if ((facetType == XML_SCHEMA_FACET_LENGTH) ||
	    (facetType == XML_SCHEMA_FACET_MINLENGTH) ||
	    (facetType == XML_SCHEMA_FACET_MAXLENGTH)) {

	    char len[25], actLen[25];

	    /* FIXME, TODO: What is the max expected string length of the
	    * this value?
	    */
	    if (nodeType == XML_ATTRIBUTE_NODE)
		msg = xmlStrcat(msg, BAD_CAST "The value '%s' has a length of '%s'; ");
	    else
		msg = xmlStrcat(msg, BAD_CAST "The value has a length of '%s'; ");

	    snprintf(len, 24, "%lu", xmlSchemaGetFacetValueAsULong(facet));
	    snprintf(actLen, 24, "%lu", length);

	    if (facetType == XML_SCHEMA_FACET_LENGTH)
		msg = xmlStrcat(msg,
		BAD_CAST "this differs from the allowed length of '%s'.\n");
	    else if (facetType == XML_SCHEMA_FACET_MAXLENGTH)
		msg = xmlStrcat(msg,
		BAD_CAST "this exceeds the allowed maximum length of '%s'.\n");
	    else if (facetType == XML_SCHEMA_FACET_MINLENGTH)
		msg = xmlStrcat(msg,
		BAD_CAST "this underruns the allowed minimum length of '%s'.\n");

	    if (nodeType == XML_ATTRIBUTE_NODE)
		xmlSchemaErr3(actxt, error, node, (const char *) msg,
		    value, (const xmlChar *) actLen, (const xmlChar *) len);
	    else
		xmlSchemaErr(actxt, error, node, (const char *) msg,
		    (const xmlChar *) actLen, (const xmlChar *) len);

	} else if (facetType == XML_SCHEMA_FACET_ENUMERATION) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not an element "
		"of the set {%s}.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		xmlSchemaFormatFacetEnumSet(actxt, &str, type));
	} else if (facetType == XML_SCHEMA_FACET_PATTERN) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not accepted "
		"by the pattern '%s'.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_MININCLUSIVE) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' is less than the "
		"minimum value allowed ('%s').\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_MAXINCLUSIVE) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' is greater than the "
		"maximum value allowed ('%s').\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_MINEXCLUSIVE) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' must be greater than "
		"'%s'.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_MAXEXCLUSIVE) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' must be less than "
		"'%s'.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_TOTALDIGITS) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' has more "
		"digits than are allowed ('%s').\n");
	    xmlSchemaErr(actxt, error, node, (const char*) msg, value,
		facet->value);
	} else if (facetType == XML_SCHEMA_FACET_FRACTIONDIGITS) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' has more fractional "
		"digits than are allowed ('%s').\n");
	    xmlSchemaErr(actxt, error, node, (const char*) msg, value,
		facet->value);
	} else if (nodeType == XML_ATTRIBUTE_NODE) {
	    msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not facet-valid.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, value, NULL);
	} else {
	    msg = xmlStrcat(msg, BAD_CAST "The value is not facet-valid.\n");
	    xmlSchemaErr(actxt, error, node, (const char *) msg, NULL, NULL);
	}
    } else {
	msg = xmlStrcat(msg, (const xmlChar *) message);
	msg = xmlStrcat(msg, BAD_CAST ".\n");
	xmlSchemaErr(actxt, error, node, (const char *) msg, str1, str2);
    }
    FREE_AND_NULL(str)
    xmlFree(msg);
}

#define VERROR(err, type, msg) \
    xmlSchemaCustomErr(ACTXT_CAST vctxt, err, NULL, type, msg, NULL, NULL);

#define VERROR_INT(func, msg) xmlSchemaInternalErr(ACTXT_CAST vctxt, func, msg);

#define PERROR_INT(func, msg) xmlSchemaInternalErr(ACTXT_CAST pctxt, func, msg);
#define PERROR_INT2(func, msg) xmlSchemaInternalErr(ACTXT_CAST ctxt, func, msg);

#define AERROR_INT(func, msg) xmlSchemaInternalErr(actxt, func, msg);


/**
 * xmlSchemaPMissingAttrErr:
 * @ctxt: the schema validation context
 * @ownerDes: the designation of  the owner
 * @ownerName: the name of the owner
 * @ownerItem: the owner as a schema object
 * @ownerElem: the owner as an element node
 * @node: the parent element node of the missing attribute node
 * @type: the corresponding type of the attribute node
 *
 * Reports an illegal attribute.
 */
static void
xmlSchemaPMissingAttrErr(xmlSchemaParserCtxtPtr ctxt,
			 xmlParserErrors error,
			 xmlSchemaBasicItemPtr ownerItem,
			 xmlNodePtr ownerElem,
			 const char *name,
			 const char *message)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);

    if (message != NULL)
	xmlSchemaPErr(ctxt, ownerElem, error, "%s: %s.\n", BAD_CAST des, BAD_CAST message);
    else
	xmlSchemaPErr(ctxt, ownerElem, error,
	    "%s: The attribute '%s' is required but missing.\n",
	    BAD_CAST des, BAD_CAST name);
    FREE_AND_NULL(des);
}


/**
 * xmlSchemaPResCompAttrErr:
 * @ctxt: the schema validation context
 * @error: the error code
 * @ownerDes: the designation of  the owner
 * @ownerItem: the owner as a schema object
 * @ownerElem: the owner as an element node
 * @name: the name of the attribute holding the QName
 * @refName: the referenced local name
 * @refURI: the referenced namespace URI
 * @message: optional message
 *
 * Used to report QName attribute values that failed to resolve
 * to schema components.
 */
static void
xmlSchemaPResCompAttrErr(xmlSchemaParserCtxtPtr ctxt,
			 xmlParserErrors error,
			 xmlSchemaBasicItemPtr ownerItem,
			 xmlNodePtr ownerElem,
			 const char *name,
			 const xmlChar *refName,
			 const xmlChar *refURI,
			 xmlSchemaTypeType refType,
			 const char *refTypeStr)
{
    xmlChar *des = NULL, *strA = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);
    if (refTypeStr == NULL)
	refTypeStr = (const char *) xmlSchemaItemTypeToStr(refType);
	xmlSchemaPErrExt(ctxt, ownerElem, error,
	    NULL, NULL, NULL,
	    "%s, attribute '%s': The QName value '%s' does not resolve to a(n) "
	    "%s.\n", BAD_CAST des, BAD_CAST name,
	    xmlSchemaFormatQName(&strA, refURI, refName),
	    BAD_CAST refTypeStr, NULL);
    FREE_AND_NULL(des)
    FREE_AND_NULL(strA)
}

/**
 * xmlSchemaPCustomAttrErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @ownerDes: the designation of the owner
 * @ownerItem: the owner as a schema object
 * @attr: the illegal attribute node
 *
 * Reports an illegal attribute during the parse.
 */
static void
xmlSchemaPCustomAttrErr(xmlSchemaParserCtxtPtr ctxt,
			xmlParserErrors error,
			xmlChar **ownerDes,
			xmlSchemaBasicItemPtr ownerItem,
			xmlAttrPtr attr,
			const char *msg)
{
    xmlChar *des = NULL;

    if (ownerDes == NULL)
	xmlSchemaFormatItemForReport(&des, NULL, ownerItem, attr->parent);
    else if (*ownerDes == NULL) {
	xmlSchemaFormatItemForReport(ownerDes, NULL, ownerItem, attr->parent);
	des = *ownerDes;
    } else
	des = *ownerDes;
    if (attr == NULL) {
	xmlSchemaPErrExt(ctxt, NULL, error, NULL, NULL, NULL,
	    "%s, attribute '%s': %s.\n",
	    BAD_CAST des, (const xmlChar *) "Unknown",
	    (const xmlChar *) msg, NULL, NULL);
    } else {
	xmlSchemaPErrExt(ctxt, (xmlNodePtr) attr, error, NULL, NULL, NULL,
	    "%s, attribute '%s': %s.\n",
	    BAD_CAST des, attr->name, (const xmlChar *) msg, NULL, NULL);
    }
    if (ownerDes == NULL)
	FREE_AND_NULL(des);
}

/**
 * xmlSchemaPIllegalAttrErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @ownerDes: the designation of the attribute's owner
 * @ownerItem: the attribute's owner item
 * @attr: the illegal attribute node
 *
 * Reports an illegal attribute during the parse.
 */
static void
xmlSchemaPIllegalAttrErr(xmlSchemaParserCtxtPtr ctxt,
			 xmlParserErrors error,
			 xmlSchemaBasicItemPtr ownerComp ATTRIBUTE_UNUSED,
			 xmlAttrPtr attr)
{
    xmlChar *strA = NULL, *strB = NULL;

    xmlSchemaFormatNodeForError(&strA, ACTXT_CAST ctxt, attr->parent);
    xmlSchemaErr4(ACTXT_CAST ctxt, error, (xmlNodePtr) attr,
	"%sThe attribute '%s' is not allowed.\n", BAD_CAST strA,
	xmlSchemaFormatQNameNs(&strB, attr->ns, attr->name),
	NULL, NULL);
    FREE_AND_NULL(strA);
    FREE_AND_NULL(strB);
}

/**
 * xmlSchemaPCustomErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item
 * @item: the schema item
 * @itemElem: the node of the schema item
 * @message: the error message
 * @str1: an optional param for the error message
 * @str2: an optional param for the error message
 * @str3: an optional param for the error message
 *
 * Reports an error during parsing.
 */
static void
xmlSchemaPCustomErrExt(xmlSchemaParserCtxtPtr ctxt,
		    xmlParserErrors error,
		    xmlSchemaBasicItemPtr item,
		    xmlNodePtr itemElem,
		    const char *message,
		    const xmlChar *str1,
		    const xmlChar *str2,
		    const xmlChar *str3)
{
    xmlChar *des = NULL, *msg = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, item, itemElem);
    msg = xmlStrdup(BAD_CAST "%s: ");
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    if ((itemElem == NULL) && (item != NULL))
	itemElem = WXS_ITEM_NODE(item);
    xmlSchemaPErrExt(ctxt, itemElem, error, NULL, NULL, NULL,
	(const char *) msg, BAD_CAST des, str1, str2, str3, NULL);
    FREE_AND_NULL(des);
    FREE_AND_NULL(msg);
}

/**
 * xmlSchemaPCustomErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item
 * @item: the schema item
 * @itemElem: the node of the schema item
 * @message: the error message
 * @str1: the optional param for the error message
 *
 * Reports an error during parsing.
 */
static void
xmlSchemaPCustomErr(xmlSchemaParserCtxtPtr ctxt,
		    xmlParserErrors error,
		    xmlSchemaBasicItemPtr item,
		    xmlNodePtr itemElem,
		    const char *message,
		    const xmlChar *str1)
{
    xmlSchemaPCustomErrExt(ctxt, error, item, itemElem, message,
	str1, NULL, NULL);
}

/**
 * xmlSchemaPAttrUseErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema type
 * @item: the schema type
 * @itemElem: the node of the schema type
 * @attr: the invalid schema attribute
 * @message: the error message
 * @str1: the optional param for the error message
 *
 * Reports an attribute use error during parsing.
 */
static void
xmlSchemaPAttrUseErr4(xmlSchemaParserCtxtPtr ctxt,
		    xmlParserErrors error,
		    xmlNodePtr node,
		    xmlSchemaBasicItemPtr ownerItem,
		    const xmlSchemaAttributeUsePtr attruse,
		    const char *message,
		    const xmlChar *str1, const xmlChar *str2,
		    const xmlChar *str3,const xmlChar *str4)
{
    xmlChar *str = NULL, *msg = NULL;

    xmlSchemaFormatItemForReport(&msg, NULL, ownerItem, NULL);
    msg = xmlStrcat(msg, BAD_CAST ", ");
    msg = xmlStrcat(msg,
	BAD_CAST xmlSchemaFormatItemForReport(&str, NULL,
	WXS_BASIC_CAST attruse, NULL));
    FREE_AND_NULL(str);
    msg = xmlStrcat(msg, BAD_CAST ": ");
    msg = xmlStrcat(msg, (const xmlChar *) message);
    msg = xmlStrcat(msg, BAD_CAST ".\n");
    xmlSchemaErr4(ACTXT_CAST ctxt, error, node,
	(const char *) msg, str1, str2, str3, str4);
    xmlFree(msg);
}

/**
 * xmlSchemaPIllegalFacetAtomicErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @type: the schema type
 * @baseType: the base type of type
 * @facet: the illegal facet
 *
 * Reports an illegal facet for atomic simple types.
 */
static void
xmlSchemaPIllegalFacetAtomicErr(xmlSchemaParserCtxtPtr ctxt,
			  xmlParserErrors error,
			  xmlSchemaTypePtr type,
			  xmlSchemaTypePtr baseType,
			  xmlSchemaFacetPtr facet)
{
    xmlChar *des = NULL, *strT = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST type, type->node);
    xmlSchemaPErrExt(ctxt, type->node, error, NULL, NULL, NULL,
	"%s: The facet '%s' is not allowed on types derived from the "
	"type %s.\n",
	BAD_CAST des, xmlSchemaFacetTypeToString(facet->type),
	xmlSchemaFormatItemForReport(&strT, NULL, WXS_BASIC_CAST baseType, NULL),
	NULL, NULL);
    FREE_AND_NULL(des);
    FREE_AND_NULL(strT);
}

/**
 * xmlSchemaPIllegalFacetListUnionErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @itemDes: the designation of the schema item involved
 * @item: the schema item involved
 * @facet: the illegal facet
 *
 * Reports an illegal facet for <list> and <union>.
 */
static void
xmlSchemaPIllegalFacetListUnionErr(xmlSchemaParserCtxtPtr ctxt,
			  xmlParserErrors error,
			  xmlSchemaTypePtr type,
			  xmlSchemaFacetPtr facet)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST type,
	type->node);
    xmlSchemaPErr(ctxt, type->node, error,
	"%s: The facet '%s' is not allowed.\n",
	BAD_CAST des, xmlSchemaFacetTypeToString(facet->type));
    FREE_AND_NULL(des);
}

/**
 * xmlSchemaPMutualExclAttrErr:
 * @ctxt: the schema validation context
 * @error: the error code
 * @elemDes: the designation of the parent element node
 * @attr: the bad attribute node
 * @type: the corresponding type of the attribute node
 *
 * Reports an illegal attribute.
 */
static void
xmlSchemaPMutualExclAttrErr(xmlSchemaParserCtxtPtr ctxt,
			 xmlParserErrors error,
			 xmlSchemaBasicItemPtr ownerItem,
			 xmlAttrPtr attr,
			 const char *name1,
			 const char *name2)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, WXS_BASIC_CAST ownerItem, attr->parent);
    xmlSchemaPErrExt(ctxt, (xmlNodePtr) attr, error, NULL, NULL, NULL,
	"%s: The attributes '%s' and '%s' are mutually exclusive.\n",
	BAD_CAST des, BAD_CAST name1, BAD_CAST name2, NULL, NULL);
    FREE_AND_NULL(des);
}

/**
 * xmlSchemaPSimpleTypeErr:
 * @ctxt:  the schema validation context
 * @error: the error code
 * @type: the type specifier
 * @ownerDes: the designation of the owner
 * @ownerItem: the schema object if existent
 * @node: the validated node
 * @value: the validated value
 *
 * Reports a simple type validation error.
 * TODO: Should this report the value of an element as well?
 */
static void
xmlSchemaPSimpleTypeErr(xmlSchemaParserCtxtPtr ctxt,
			xmlParserErrors error,
			xmlSchemaBasicItemPtr ownerItem ATTRIBUTE_UNUSED,
			xmlNodePtr node,
			xmlSchemaTypePtr type,
			const char *expected,
			const xmlChar *value,
			const char *message,
			const xmlChar *str1,
			const xmlChar *str2)
{
    xmlChar *msg = NULL;

    xmlSchemaFormatNodeForError(&msg, ACTXT_CAST ctxt, node);
    if (message == NULL) {
	/*
	* Use default messages.
	*/
	if (type != NULL) {
	    if (node->type == XML_ATTRIBUTE_NODE)
		msg = xmlStrcat(msg, BAD_CAST "'%s' is not a valid value of ");
	    else
		msg = xmlStrcat(msg, BAD_CAST "The character content is not a "
		"valid value of ");
	    if (! xmlSchemaIsGlobalItem(type))
		msg = xmlStrcat(msg, BAD_CAST "the local ");
	    else
		msg = xmlStrcat(msg, BAD_CAST "the ");

	    if (WXS_IS_ATOMIC(type))
		msg = xmlStrcat(msg, BAD_CAST "atomic type");
	    else if (WXS_IS_LIST(type))
		msg = xmlStrcat(msg, BAD_CAST "list type");
	    else if (WXS_IS_UNION(type))
		msg = xmlStrcat(msg, BAD_CAST "union type");

	    if (xmlSchemaIsGlobalItem(type)) {
		xmlChar *str = NULL;
		msg = xmlStrcat(msg, BAD_CAST " '");
		if (type->builtInType != 0) {
		    msg = xmlStrcat(msg, BAD_CAST "xs:");
		    msg = xmlStrcat(msg, type->name);
		} else
		    msg = xmlStrcat(msg,
			xmlSchemaFormatQName(&str,
			    type->targetNamespace, type->name));
		msg = xmlStrcat(msg, BAD_CAST "'.");
		FREE_AND_NULL(str);
	    }
	} else {
	    if (node->type == XML_ATTRIBUTE_NODE)
		msg = xmlStrcat(msg, BAD_CAST "The value '%s' is not valid.");
	    else
		msg = xmlStrcat(msg, BAD_CAST "The character content is not "
		"valid.");
	}
	if (expected) {
	    msg = xmlStrcat(msg, BAD_CAST " Expected is '");
	    msg = xmlStrcat(msg, BAD_CAST expected);
	    msg = xmlStrcat(msg, BAD_CAST "'.\n");
	} else
	    msg = xmlStrcat(msg, BAD_CAST "\n");
	if (node->type == XML_ATTRIBUTE_NODE)
	    xmlSchemaPErr(ctxt, node, error, (const char *) msg, value, NULL);
	else
	    xmlSchemaPErr(ctxt, node, error, (const char *) msg, NULL, NULL);
    } else {
	msg = xmlStrcat(msg, BAD_CAST message);
	msg = xmlStrcat(msg, BAD_CAST ".\n");
	xmlSchemaPErrExt(ctxt, node, error, NULL, NULL, NULL,
	     (const char*) msg, str1, str2, NULL, NULL, NULL);
    }
    /* Cleanup. */
    FREE_AND_NULL(msg)
}

/**
 * xmlSchemaPContentErr:
 * @ctxt: the schema parser context
 * @error: the error code
 * @onwerDes: the designation of the holder of the content
 * @ownerItem: the owner item of the holder of the content
 * @ownerElem: the node of the holder of the content
 * @child: the invalid child node
 * @message: the optional error message
 * @content: the optional string describing the correct content
 *
 * Reports an error concerning the content of a schema element.
 */
static void
xmlSchemaPContentErr(xmlSchemaParserCtxtPtr ctxt,
		     xmlParserErrors error,
		     xmlSchemaBasicItemPtr ownerItem,
		     xmlNodePtr ownerElem,
		     xmlNodePtr child,
		     const char *message,
		     const char *content)
{
    xmlChar *des = NULL;

    xmlSchemaFormatItemForReport(&des, NULL, ownerItem, ownerElem);
    if (message != NULL)
	xmlSchemaPErr2(ctxt, ownerElem, child, error,
	    "%s: %s.\n",
	    BAD_CAST des, BAD_CAST message);
    else {
	if (content != NULL) {
	    xmlSchemaPErr2(ctxt, ownerElem, child, error,
		"%s: The content is not valid. Expected is %s.\n",
		BAD_CAST des, BAD_CAST content);
	} else {
	    xmlSchemaPErr2(ctxt, ownerElem, child, error,
		"%s: The content is not valid.\n",
		BAD_CAST des, NULL);
	}
    }
    FREE_AND_NULL(des)
}

/************************************************************************
 * 									*
 * 			Streamable error functions                      *
 * 									*
 ************************************************************************/




/************************************************************************
 * 									*
 * 			Validation helper functions			*
 * 									*
 ************************************************************************/


/************************************************************************
 * 									*
 * 			Allocation functions				*
 * 									*
 ************************************************************************/

/**
 * xmlSchemaNewSchemaForParserCtxt:
 * @ctxt:  a schema validation context
 *
 * Allocate a new Schema structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static xmlSchemaPtr
xmlSchemaNewSchema(xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaPtr ret;

    ret = (xmlSchemaPtr) xmlMalloc(sizeof(xmlSchema));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating schema", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchema));
    ret->dict = ctxt->dict;
    xmlDictReference(ret->dict);

    return (ret);
}

/**
 * xmlSchemaNewFacet:
 *
 * Allocate a new Facet structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
xmlSchemaFacetPtr
xmlSchemaNewFacet(void)
{
    xmlSchemaFacetPtr ret;

    ret = (xmlSchemaFacetPtr) xmlMalloc(sizeof(xmlSchemaFacet));
    if (ret == NULL) {
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaFacet));

    return (ret);
}

/**
 * xmlSchemaNewAnnot:
 * @ctxt:  a schema validation context
 * @node:  a node
 *
 * Allocate a new annotation structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static xmlSchemaAnnotPtr
xmlSchemaNewAnnot(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node)
{
    xmlSchemaAnnotPtr ret;

    ret = (xmlSchemaAnnotPtr) xmlMalloc(sizeof(xmlSchemaAnnot));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating annotation", node);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAnnot));
    ret->content = node;
    return (ret);
}

static xmlSchemaItemListPtr
xmlSchemaItemListCreate(void)
{
    xmlSchemaItemListPtr ret;

    ret = xmlMalloc(sizeof(xmlSchemaItemList));
    if (ret == NULL) {
	xmlSchemaPErrMemory(NULL,
	    "allocating an item list structure", NULL);
	return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaItemList));
    return (ret);
}

static void
xmlSchemaItemListClear(xmlSchemaItemListPtr list)
{
    if (list->items != NULL) {
	xmlFree(list->items);
	list->items = NULL;
    }
    list->nbItems = 0;
    list->sizeItems = 0;
}

static int
xmlSchemaItemListAdd(xmlSchemaItemListPtr list, void *item)
{
    if (list->items == NULL) {
	list->items = (void **) xmlMalloc(
	    20 * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
	    return(-1);
	}
	list->sizeItems = 20;
    } else if (list->sizeItems <= list->nbItems) {
	list->sizeItems *= 2;
	list->items = (void **) xmlRealloc(list->items,
	    list->sizeItems * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "growing item list", NULL);
	    list->sizeItems = 0;
	    return(-1);
	}
    }
    list->items[list->nbItems++] = item;
    return(0);
}

static int
xmlSchemaItemListAddSize(xmlSchemaItemListPtr list,
			 int initialSize,
			 void *item)
{
    if (list->items == NULL) {
	if (initialSize <= 0)
	    initialSize = 1;
	list->items = (void **) xmlMalloc(
	    initialSize * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
	    return(-1);
	}
	list->sizeItems = initialSize;
    } else if (list->sizeItems <= list->nbItems) {
	list->sizeItems *= 2;
	list->items = (void **) xmlRealloc(list->items,
	    list->sizeItems * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "growing item list", NULL);
	    list->sizeItems = 0;
	    return(-1);
	}
    }
    list->items[list->nbItems++] = item;
    return(0);
}

static int
xmlSchemaItemListInsert(xmlSchemaItemListPtr list, void *item, int idx)
{
    if (list->items == NULL) {
	list->items = (void **) xmlMalloc(
	    20 * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
	    return(-1);
	}
	list->sizeItems = 20;
    } else if (list->sizeItems <= list->nbItems) {
	list->sizeItems *= 2;
	list->items = (void **) xmlRealloc(list->items,
	    list->sizeItems * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "growing item list", NULL);
	    list->sizeItems = 0;
	    return(-1);
	}
    }
    /*
    * Just append if the index is greater/equal than the item count.
    */
    if (idx >= list->nbItems) {
	list->items[list->nbItems++] = item;
    } else {
	int i;
	for (i = list->nbItems; i > idx; i--)
	    list->items[i] = list->items[i-1];
	list->items[idx] = item;
	list->nbItems++;
    }
    return(0);
}

#if 0 /* enable if ever needed */
static int
xmlSchemaItemListInsertSize(xmlSchemaItemListPtr list,
			    int initialSize,
			    void *item,
			    int idx)
{
    if (list->items == NULL) {
	if (initialSize <= 0)
	    initialSize = 1;
	list->items = (void **) xmlMalloc(
	    initialSize * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "allocating new item list", NULL);
	    return(-1);
	}
	list->sizeItems = initialSize;
    } else if (list->sizeItems <= list->nbItems) {
	list->sizeItems *= 2;
	list->items = (void **) xmlRealloc(list->items,
	    list->sizeItems * sizeof(void *));
	if (list->items == NULL) {
	    xmlSchemaPErrMemory(NULL, "growing item list", NULL);
	    list->sizeItems = 0;
	    return(-1);
	}
    }
    /*
    * Just append if the index is greater/equal than the item count.
    */
    if (idx >= list->nbItems) {
	list->items[list->nbItems++] = item;
    } else {
	int i;
	for (i = list->nbItems; i > idx; i--)
	    list->items[i] = list->items[i-1];
	list->items[idx] = item;
	list->nbItems++;
    }
    return(0);
}
#endif

static int
xmlSchemaItemListRemove(xmlSchemaItemListPtr list, int idx)
{
    int i;
    if ((list->items == NULL) || (idx >= list->nbItems)) {
	xmlSchemaPSimpleErr("Internal error: xmlSchemaItemListRemove, "
	    "index error.\n");
	return(-1);
    }

    if (list->nbItems == 1) {
	/* TODO: Really free the list? */
	xmlFree(list->items);
	list->items = NULL;
	list->nbItems = 0;
	list->sizeItems = 0;
    } else if (list->nbItems -1 == idx) {
	list->nbItems--;
    } else {
	for (i = idx; i < list->nbItems -1; i++)
	    list->items[i] = list->items[i+1];
	list->nbItems--;
    }
    return(0);
}

/**
 * xmlSchemaItemListFree:
 * @annot:  a schema type structure
 *
 * Deallocate a annotation structure
 */
static void
xmlSchemaItemListFree(xmlSchemaItemListPtr list)
{
    if (list == NULL)
	return;
    if (list->items != NULL)
	xmlFree(list->items);
    xmlFree(list);
}

static void
xmlSchemaBucketFree(xmlSchemaBucketPtr bucket)
{
    if (bucket == NULL)
	return;
    if (bucket->globals != NULL) {
	xmlSchemaComponentListFree(bucket->globals);
	xmlSchemaItemListFree(bucket->globals);
    }
    if (bucket->locals != NULL) {
	xmlSchemaComponentListFree(bucket->locals);
	xmlSchemaItemListFree(bucket->locals);
    }
    if (bucket->relations != NULL) {
	xmlSchemaSchemaRelationPtr prev, cur = bucket->relations;
	do {
	    prev = cur;
	    cur = cur->next;
	    xmlFree(prev);
	} while (cur != NULL);
    }
    if ((! bucket->preserveDoc) && (bucket->doc != NULL)) {
	xmlFreeDoc(bucket->doc);
    }
    if (bucket->type == XML_SCHEMA_SCHEMA_IMPORT) {
	if (WXS_IMPBUCKET(bucket)->schema != NULL)
	    xmlSchemaFree(WXS_IMPBUCKET(bucket)->schema);
    }
    xmlFree(bucket);
}

static xmlSchemaBucketPtr
xmlSchemaBucketCreate(xmlSchemaParserCtxtPtr pctxt,
			 int type, const xmlChar *targetNamespace)
{
    xmlSchemaBucketPtr ret;
    int size;
    xmlSchemaPtr mainSchema;

    if (WXS_CONSTRUCTOR(pctxt)->mainSchema == NULL) {
	PERROR_INT("xmlSchemaBucketCreate",
	    "no main schema on constructor");
	return(NULL);
    }
    mainSchema = WXS_CONSTRUCTOR(pctxt)->mainSchema;
    /* Create the schema bucket. */
    if (WXS_IS_BUCKET_INCREDEF(type))
	size = sizeof(xmlSchemaInclude);
    else
	size = sizeof(xmlSchemaImport);
    ret = (xmlSchemaBucketPtr) xmlMalloc(size);
    if (ret == NULL) {
	xmlSchemaPErrMemory(NULL, "allocating schema bucket", NULL);
	return(NULL);
    }
    memset(ret, 0, size);
    ret->targetNamespace = targetNamespace;
    ret->type = type;
    ret->globals = xmlSchemaItemListCreate();
    if (ret->globals == NULL) {
	xmlFree(ret);
	return(NULL);
    }
    ret->locals = xmlSchemaItemListCreate();
    if (ret->locals == NULL) {
	xmlFree(ret);
	return(NULL);
    }
    /*
    * The following will assure that only the first bucket is marked as
    * XML_SCHEMA_SCHEMA_MAIN and it points to the *main* schema.
    * For each following import buckets an xmlSchema will be created.
    * An xmlSchema will be created for every distinct targetNamespace.
    * We assign the targetNamespace to the schemata here.
    */
    if (! WXS_HAS_BUCKETS(pctxt)) {
	if (WXS_IS_BUCKET_INCREDEF(type)) {
	    PERROR_INT("xmlSchemaBucketCreate",
		"first bucket but it's an include or redefine");
	    xmlSchemaBucketFree(ret);
	    return(NULL);
	}
	/* Force the type to be XML_SCHEMA_SCHEMA_MAIN. */
	ret->type = XML_SCHEMA_SCHEMA_MAIN;
	/* Point to the *main* schema. */
	WXS_CONSTRUCTOR(pctxt)->mainBucket = ret;
	WXS_IMPBUCKET(ret)->schema = mainSchema;
	/*
	* Ensure that the main schema gets a targetNamespace.
	*/
	mainSchema->targetNamespace = targetNamespace;
    } else {
	if (type == XML_SCHEMA_SCHEMA_MAIN) {
	    PERROR_INT("xmlSchemaBucketCreate",
		"main bucket but it's not the first one");
	    xmlSchemaBucketFree(ret);
	    return(NULL);
	} else if (type == XML_SCHEMA_SCHEMA_IMPORT) {
	    /*
	    * Create a schema for imports and assign the
	    * targetNamespace.
	    */
	    WXS_IMPBUCKET(ret)->schema = xmlSchemaNewSchema(pctxt);
	    if (WXS_IMPBUCKET(ret)->schema == NULL) {
		xmlSchemaBucketFree(ret);
		return(NULL);
	    }
	    WXS_IMPBUCKET(ret)->schema->targetNamespace = targetNamespace;
	}
    }
    if (WXS_IS_BUCKET_IMPMAIN(type)) {
	int res;
	/*
	* Imports go into the "schemasImports" slot of the main *schema*.
	* Note that we create an import entry for the main schema as well; i.e.,
	* even if there's only one schema, we'll get an import.
	*/
	if (mainSchema->schemasImports == NULL) {
	    mainSchema->schemasImports = xmlHashCreateDict(5,
		WXS_CONSTRUCTOR(pctxt)->dict);
	    if (mainSchema->schemasImports == NULL) {
		xmlSchemaBucketFree(ret);
		return(NULL);
	    }
	}
	if (targetNamespace == NULL)
	    res = xmlHashAddEntry(mainSchema->schemasImports,
		XML_SCHEMAS_NO_NAMESPACE, ret);
	else
	    res = xmlHashAddEntry(mainSchema->schemasImports,
		targetNamespace, ret);
	if (res != 0) {
	    PERROR_INT("xmlSchemaBucketCreate",
		"failed to add the schema bucket to the hash");
	    xmlSchemaBucketFree(ret);
	    return(NULL);
	}
    } else {
	/* Set the @ownerImport of an include bucket. */
	if (WXS_IS_BUCKET_IMPMAIN(WXS_CONSTRUCTOR(pctxt)->bucket->type))
	    WXS_INCBUCKET(ret)->ownerImport =
		WXS_IMPBUCKET(WXS_CONSTRUCTOR(pctxt)->bucket);
	else
	    WXS_INCBUCKET(ret)->ownerImport =
		WXS_INCBUCKET(WXS_CONSTRUCTOR(pctxt)->bucket)->ownerImport;

	/* Includes got into the "includes" slot of the *main* schema. */
	if (mainSchema->includes == NULL) {
	    mainSchema->includes = xmlSchemaItemListCreate();
	    if (mainSchema->includes == NULL) {
		xmlSchemaBucketFree(ret);
		return(NULL);
	    }
	}
	xmlSchemaItemListAdd(mainSchema->includes, ret);
    }
    /*
    * Add to list of all buckets; this is used for lookup
    * during schema construction time only.
    */
    if (xmlSchemaItemListAdd(WXS_CONSTRUCTOR(pctxt)->buckets, ret) == -1)
	return(NULL);
    return(ret);
}

static int
xmlSchemaAddItemSize(xmlSchemaItemListPtr *list, int initialSize, void *item)
{
    if (*list == NULL) {
	*list = xmlSchemaItemListCreate();
	if (*list == NULL)
	    return(-1);
    }
    xmlSchemaItemListAddSize(*list, initialSize, item);
    return(0);
}

/**
 * xmlSchemaFreeAnnot:
 * @annot:  a schema type structure
 *
 * Deallocate a annotation structure
 */
static void
xmlSchemaFreeAnnot(xmlSchemaAnnotPtr annot)
{
    if (annot == NULL)
        return;
    if (annot->next == NULL) {
	xmlFree(annot);
    } else {
	xmlSchemaAnnotPtr prev;

	do {
	    prev = annot;
	    annot = annot->next;
	    xmlFree(prev);
	} while (annot != NULL);
    }
}

/**
 * xmlSchemaFreeNotation:
 * @schema:  a schema notation structure
 *
 * Deallocate a Schema Notation structure.
 */
static void
xmlSchemaFreeNotation(xmlSchemaNotationPtr nota)
{
    if (nota == NULL)
        return;
    xmlFree(nota);
}

/**
 * xmlSchemaFreeAttribute:
 * @attr:  an attribute declaration
 *
 * Deallocates an attribute declaration structure.
 */
static void
xmlSchemaFreeAttribute(xmlSchemaAttributePtr attr)
{
    if (attr == NULL)
        return;
    if (attr->annot != NULL)
	xmlSchemaFreeAnnot(attr->annot);
    if (attr->defVal != NULL)
	xmlSchemaFreeValue(attr->defVal);
    xmlFree(attr);
}

/**
 * xmlSchemaFreeAttributeUse:
 * @use:  an attribute use
 *
 * Deallocates an attribute use structure.
 */
static void
xmlSchemaFreeAttributeUse(xmlSchemaAttributeUsePtr use)
{
    if (use == NULL)
        return;
    if (use->annot != NULL)
	xmlSchemaFreeAnnot(use->annot);
    if (use->defVal != NULL)
	xmlSchemaFreeValue(use->defVal);
    xmlFree(use);
}

/**
 * xmlSchemaFreeAttributeUseProhib:
 * @prohib:  an attribute use prohibition
 *
 * Deallocates an attribute use structure.
 */
static void
xmlSchemaFreeAttributeUseProhib(xmlSchemaAttributeUseProhibPtr prohib)
{
    if (prohib == NULL)
        return;
    xmlFree(prohib);
}

/**
 * xmlSchemaFreeWildcardNsSet:
 * set:  a schema wildcard namespace
 *
 * Deallocates a list of wildcard constraint structures.
 */
static void
xmlSchemaFreeWildcardNsSet(xmlSchemaWildcardNsPtr set)
{
    xmlSchemaWildcardNsPtr next;

    while (set != NULL) {
	next = set->next;
	xmlFree(set);
	set = next;
    }
}

/**
 * xmlSchemaFreeWildcard:
 * @wildcard:  a wildcard structure
 *
 * Deallocates a wildcard structure.
 */
void
xmlSchemaFreeWildcard(xmlSchemaWildcardPtr wildcard)
{
    if (wildcard == NULL)
        return;
    if (wildcard->annot != NULL)
        xmlSchemaFreeAnnot(wildcard->annot);
    if (wildcard->nsSet != NULL)
	xmlSchemaFreeWildcardNsSet(wildcard->nsSet);
    if (wildcard->negNsSet != NULL)
	xmlFree(wildcard->negNsSet);
    xmlFree(wildcard);
}

/**
 * xmlSchemaFreeAttributeGroup:
 * @schema:  a schema attribute group structure
 *
 * Deallocate a Schema Attribute Group structure.
 */
static void
xmlSchemaFreeAttributeGroup(xmlSchemaAttributeGroupPtr attrGr)
{
    if (attrGr == NULL)
        return;
    if (attrGr->annot != NULL)
        xmlSchemaFreeAnnot(attrGr->annot);
    if (attrGr->attrUses != NULL)
	xmlSchemaItemListFree(WXS_LIST_CAST attrGr->attrUses);
    xmlFree(attrGr);
}

/**
 * xmlSchemaFreeQNameRef:
 * @item: a QName reference structure
 *
 * Deallocatea a QName reference structure.
 */
static void
xmlSchemaFreeQNameRef(xmlSchemaQNameRefPtr item)
{
    xmlFree(item);
}

/**
 * xmlSchemaFreeTypeLinkList:
 * @alink: a type link
 *
 * Deallocate a list of types.
 */
static void
xmlSchemaFreeTypeLinkList(xmlSchemaTypeLinkPtr link)
{
    xmlSchemaTypeLinkPtr next;

    while (link != NULL) {
	next = link->next;
	xmlFree(link);
	link = next;
    }
}

static void
xmlSchemaFreeIDCStateObjList(xmlSchemaIDCStateObjPtr sto)
{
    xmlSchemaIDCStateObjPtr next;
    while (sto != NULL) {
	next = sto->next;
	if (sto->history != NULL)
	    xmlFree(sto->history);
	if (sto->xpathCtxt != NULL)
	    xmlFreeStreamCtxt((xmlStreamCtxtPtr) sto->xpathCtxt);
	xmlFree(sto);
	sto = next;
    }
}

/**
 * xmlSchemaFreeIDC:
 * @idc: a identity-constraint definition
 *
 * Deallocates an identity-constraint definition.
 */
static void
xmlSchemaFreeIDC(xmlSchemaIDCPtr idcDef)
{
    xmlSchemaIDCSelectPtr cur, prev;

    if (idcDef == NULL)
	return;
    if (idcDef->annot != NULL)
        xmlSchemaFreeAnnot(idcDef->annot);
    /* Selector */
    if (idcDef->selector != NULL) {
	if (idcDef->selector->xpathComp != NULL)
	    xmlFreePattern((xmlPatternPtr) idcDef->selector->xpathComp);
	xmlFree(idcDef->selector);
    }
    /* Fields */
    if (idcDef->fields != NULL) {
	cur = idcDef->fields;
	do {
	    prev = cur;
	    cur = cur->next;
	    if (prev->xpathComp != NULL)
		xmlFreePattern((xmlPatternPtr) prev->xpathComp);
	    xmlFree(prev);
	} while (cur != NULL);
    }
    xmlFree(idcDef);
}

/**
 * xmlSchemaFreeElement:
 * @schema:  a schema element structure
 *
 * Deallocate a Schema Element structure.
 */
static void
xmlSchemaFreeElement(xmlSchemaElementPtr elem)
{
    if (elem == NULL)
        return;
    if (elem->annot != NULL)
        xmlSchemaFreeAnnot(elem->annot);
    if (elem->contModel != NULL)
        xmlRegFreeRegexp(elem->contModel);
    if (elem->defVal != NULL)
	xmlSchemaFreeValue(elem->defVal);
    xmlFree(elem);
}

/**
 * xmlSchemaFreeFacet:
 * @facet:  a schema facet structure
 *
 * Deallocate a Schema Facet structure.
 */
void
xmlSchemaFreeFacet(xmlSchemaFacetPtr facet)
{
    if (facet == NULL)
        return;
    if (facet->val != NULL)
        xmlSchemaFreeValue(facet->val);
    if (facet->regexp != NULL)
        xmlRegFreeRegexp(facet->regexp);
    if (facet->annot != NULL)
        xmlSchemaFreeAnnot(facet->annot);
    xmlFree(facet);
}

/**
 * xmlSchemaFreeType:
 * @type:  a schema type structure
 *
 * Deallocate a Schema Type structure.
 */
void
xmlSchemaFreeType(xmlSchemaTypePtr type)
{
    if (type == NULL)
        return;
    if (type->annot != NULL)
        xmlSchemaFreeAnnot(type->annot);
    if (type->facets != NULL) {
        xmlSchemaFacetPtr facet, next;

        facet = type->facets;
        while (facet != NULL) {
            next = facet->next;
            xmlSchemaFreeFacet(facet);
            facet = next;
        }
    }
    if (type->attrUses != NULL)
	xmlSchemaItemListFree((xmlSchemaItemListPtr) type->attrUses);
    if (type->memberTypes != NULL)
	xmlSchemaFreeTypeLinkList(type->memberTypes);
    if (type->facetSet != NULL) {
	xmlSchemaFacetLinkPtr next, link;

	link = type->facetSet;
	do {
	    next = link->next;
	    xmlFree(link);
	    link = next;
	} while (link != NULL);
    }
    if (type->contModel != NULL)
        xmlRegFreeRegexp(type->contModel);
    xmlFree(type);
}

/**
 * xmlSchemaFreeModelGroupDef:
 * @item:  a schema model group definition
 *
 * Deallocates a schema model group definition.
 */
static void
xmlSchemaFreeModelGroupDef(xmlSchemaModelGroupDefPtr item)
{
    if (item->annot != NULL)
	xmlSchemaFreeAnnot(item->annot);
    xmlFree(item);
}

/**
 * xmlSchemaFreeModelGroup:
 * @item:  a schema model group
 *
 * Deallocates a schema model group structure.
 */
static void
xmlSchemaFreeModelGroup(xmlSchemaModelGroupPtr item)
{
    if (item->annot != NULL)
	xmlSchemaFreeAnnot(item->annot);
    xmlFree(item);
}

static void
xmlSchemaComponentListFree(xmlSchemaItemListPtr list)
{
    if ((list == NULL) || (list->nbItems == 0))
	return;
    {
	xmlSchemaTreeItemPtr item;
	xmlSchemaTreeItemPtr *items = (xmlSchemaTreeItemPtr *) list->items;
	int i;

	for (i = 0; i < list->nbItems; i++) {
	    item = items[i];
	    if (item == NULL)
		continue;
	    switch (item->type) {
		case XML_SCHEMA_TYPE_SIMPLE:
		case XML_SCHEMA_TYPE_COMPLEX:
		    xmlSchemaFreeType((xmlSchemaTypePtr) item);
		    break;
		case XML_SCHEMA_TYPE_ATTRIBUTE:
		    xmlSchemaFreeAttribute((xmlSchemaAttributePtr) item);
		    break;
		case XML_SCHEMA_TYPE_ATTRIBUTE_USE:
		    xmlSchemaFreeAttributeUse((xmlSchemaAttributeUsePtr) item);
		    break;
		case XML_SCHEMA_EXTRA_ATTR_USE_PROHIB:
		    xmlSchemaFreeAttributeUseProhib(
			(xmlSchemaAttributeUseProhibPtr) item);
		    break;
		case XML_SCHEMA_TYPE_ELEMENT:
		    xmlSchemaFreeElement((xmlSchemaElementPtr) item);
		    break;
		case XML_SCHEMA_TYPE_PARTICLE:
		    if (item->annot != NULL)
			xmlSchemaFreeAnnot(item->annot);
		    xmlFree(item);
		    break;
		case XML_SCHEMA_TYPE_SEQUENCE:
		case XML_SCHEMA_TYPE_CHOICE:
		case XML_SCHEMA_TYPE_ALL:
		    xmlSchemaFreeModelGroup((xmlSchemaModelGroupPtr) item);
		    break;
		case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
		    xmlSchemaFreeAttributeGroup(
			(xmlSchemaAttributeGroupPtr) item);
		    break;
		case XML_SCHEMA_TYPE_GROUP:
		    xmlSchemaFreeModelGroupDef(
			(xmlSchemaModelGroupDefPtr) item);
		    break;
		case XML_SCHEMA_TYPE_ANY:
		case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
		    xmlSchemaFreeWildcard((xmlSchemaWildcardPtr) item);
		    break;
		case XML_SCHEMA_TYPE_IDC_KEY:
		case XML_SCHEMA_TYPE_IDC_UNIQUE:
		case XML_SCHEMA_TYPE_IDC_KEYREF:
		    xmlSchemaFreeIDC((xmlSchemaIDCPtr) item);
		    break;
		case XML_SCHEMA_TYPE_NOTATION:
		    xmlSchemaFreeNotation((xmlSchemaNotationPtr) item);
		    break;
		case XML_SCHEMA_EXTRA_QNAMEREF:
		    xmlSchemaFreeQNameRef((xmlSchemaQNameRefPtr) item);
		    break;
		default: {
		    /* TODO: This should never be hit. */
		    xmlSchemaPSimpleInternalErr(NULL,
			"Internal error: xmlSchemaComponentListFree, "
			"unexpected component type '%s'\n",
			(const xmlChar *) WXS_ITEM_TYPE_NAME(item));
			 }
		    break;
	    }
	}
	list->nbItems = 0;
    }
}

/**
 * xmlSchemaFree:
 * @schema:  a schema structure
 *
 * Deallocate a Schema structure.
 */
void
xmlSchemaFree(xmlSchemaPtr schema)
{
    if (schema == NULL)
        return;
    /* @volatiles is not used anymore :-/ */
    if (schema->volatiles != NULL)
	TODO
    /*
    * Note that those slots are not responsible for freeing
    * schema components anymore; this will now be done by
    * the schema buckets.
    */
    if (schema->notaDecl != NULL)
        xmlHashFree(schema->notaDecl, NULL);
    if (schema->attrDecl != NULL)
        xmlHashFree(schema->attrDecl, NULL);
    if (schema->attrgrpDecl != NULL)
        xmlHashFree(schema->attrgrpDecl, NULL);
    if (schema->elemDecl != NULL)
        xmlHashFree(schema->elemDecl, NULL);
    if (schema->typeDecl != NULL)
        xmlHashFree(schema->typeDecl, NULL);
    if (schema->groupDecl != NULL)
        xmlHashFree(schema->groupDecl, NULL);
    if (schema->idcDef != NULL)
        xmlHashFree(schema->idcDef, NULL);

    if (schema->schemasImports != NULL)
	xmlHashFree(schema->schemasImports,
		    (xmlHashDeallocator) xmlSchemaBucketFree);
    if (schema->includes != NULL) {
	xmlSchemaItemListPtr list = (xmlSchemaItemListPtr) schema->includes;
	int i;
	for (i = 0; i < list->nbItems; i++) {
	    xmlSchemaBucketFree((xmlSchemaBucketPtr) list->items[i]);
	}
	xmlSchemaItemListFree(list);
    }
    if (schema->annot != NULL)
        xmlSchemaFreeAnnot(schema->annot);
    /* Never free the doc here, since this will be done by the buckets. */

    xmlDictFree(schema->dict);
    xmlFree(schema);
}

/************************************************************************
 * 									*
 * 			Debug functions					*
 * 									*
 ************************************************************************/

#ifdef LIBXML_OUTPUT_ENABLED

static void
xmlSchemaTypeDump(xmlSchemaTypePtr type, FILE * output); /* forward */

/**
 * xmlSchemaElementDump:
 * @elem:  an element
 * @output:  the file output
 *
 * Dump the element
 */
static void
xmlSchemaElementDump(xmlSchemaElementPtr elem, FILE * output,
                     const xmlChar * name ATTRIBUTE_UNUSED,
		     const xmlChar * namespace ATTRIBUTE_UNUSED,
                     const xmlChar * context ATTRIBUTE_UNUSED)
{
    if (elem == NULL)
        return;


    fprintf(output, "Element");
    if (elem->flags & XML_SCHEMAS_ELEM_GLOBAL)
	fprintf(output, " (global)");
    fprintf(output, ": '%s' ", elem->name);
    if (namespace != NULL)
	fprintf(output, "ns '%s'", namespace);
    fprintf(output, "\n");
#if 0
    if ((elem->minOccurs != 1) || (elem->maxOccurs != 1)) {
	fprintf(output, "  min %d ", elem->minOccurs);
        if (elem->maxOccurs >= UNBOUNDED)
            fprintf(output, "max: unbounded\n");
        else if (elem->maxOccurs != 1)
            fprintf(output, "max: %d\n", elem->maxOccurs);
        else
            fprintf(output, "\n");
    }
#endif
    /*
    * Misc other properties.
    */
    if ((elem->flags & XML_SCHEMAS_ELEM_NILLABLE) ||
	(elem->flags & XML_SCHEMAS_ELEM_ABSTRACT) ||
	(elem->flags & XML_SCHEMAS_ELEM_FIXED) ||
	(elem->flags & XML_SCHEMAS_ELEM_DEFAULT)) {
	fprintf(output, "  props: ");
	if (elem->flags & XML_SCHEMAS_ELEM_FIXED)
	    fprintf(output, "[fixed] ");
	if (elem->flags & XML_SCHEMAS_ELEM_DEFAULT)
	    fprintf(output, "[default] ");
	if (elem->flags & XML_SCHEMAS_ELEM_ABSTRACT)
	    fprintf(output, "[abstract] ");
	if (elem->flags & XML_SCHEMAS_ELEM_NILLABLE)
	    fprintf(output, "[nillable] ");
	fprintf(output, "\n");
    }
    /*
    * Default/fixed value.
    */
    if (elem->value != NULL)
	fprintf(output, "  value: '%s'\n", elem->value);
    /*
    * Type.
    */
    if (elem->namedType != NULL) {
	fprintf(output, "  type: '%s' ", elem->namedType);
	if (elem->namedTypeNs != NULL)
	    fprintf(output, "ns '%s'\n", elem->namedTypeNs);
	else
	    fprintf(output, "\n");
    } else if (elem->subtypes != NULL) {
	/*
	* Dump local types.
	*/
	xmlSchemaTypeDump(elem->subtypes, output);
    }
    /*
    * Substitution group.
    */
    if (elem->substGroup != NULL) {
	fprintf(output, "  substitutionGroup: '%s' ", elem->substGroup);
	if (elem->substGroupNs != NULL)
	    fprintf(output, "ns '%s'\n", elem->substGroupNs);
	else
	    fprintf(output, "\n");
    }
}

/**
 * xmlSchemaAnnotDump:
 * @output:  the file output
 * @annot:  a annotation
 *
 * Dump the annotation
 */
static void
xmlSchemaAnnotDump(FILE * output, xmlSchemaAnnotPtr annot)
{
    xmlChar *content;

    if (annot == NULL)
        return;

    content = xmlNodeGetContent(annot->content);
    if (content != NULL) {
        fprintf(output, "  Annot: %s\n", content);
        xmlFree(content);
    } else
        fprintf(output, "  Annot: empty\n");
}

/**
 * xmlSchemaContentModelDump:
 * @particle: the schema particle
 * @output: the file output
 * @depth: the depth used for intentation
 *
 * Dump a SchemaType structure
 */
static void
xmlSchemaContentModelDump(xmlSchemaParticlePtr particle, FILE * output, int depth)
{
    xmlChar *str = NULL;
    xmlSchemaTreeItemPtr term;
    char shift[100];
    int i;

    if (particle == NULL)
	return;
    for (i = 0;((i < depth) && (i < 25));i++)
        shift[2 * i] = shift[2 * i + 1] = ' ';
    shift[2 * i] = shift[2 * i + 1] = 0;
    fprintf(output, "%s", shift);
    if (particle->children == NULL) {
	fprintf(output, "MISSING particle term\n");
	return;
    }
    term = particle->children;
    if (term == NULL) {
	fprintf(output, "(NULL)");
    } else {
	switch (term->type) {
	    case XML_SCHEMA_TYPE_ELEMENT:
		fprintf(output, "ELEM '%s'", xmlSchemaFormatQName(&str,
		    ((xmlSchemaElementPtr)term)->targetNamespace,
		    ((xmlSchemaElementPtr)term)->name));
		FREE_AND_NULL(str);
		break;
	    case XML_SCHEMA_TYPE_SEQUENCE:
		fprintf(output, "SEQUENCE");
		break;
	    case XML_SCHEMA_TYPE_CHOICE:
		fprintf(output, "CHOICE");
		break;
	    case XML_SCHEMA_TYPE_ALL:
		fprintf(output, "ALL");
		break;
	    case XML_SCHEMA_TYPE_ANY:
		fprintf(output, "ANY");
		break;
	    default:
		fprintf(output, "UNKNOWN\n");
		return;
	}
    }
    if (particle->minOccurs != 1)
	fprintf(output, " min: %d", particle->minOccurs);
    if (particle->maxOccurs >= UNBOUNDED)
	fprintf(output, " max: unbounded");
    else if (particle->maxOccurs != 1)
	fprintf(output, " max: %d", particle->maxOccurs);
    fprintf(output, "\n");
    if (term &&
	((term->type == XML_SCHEMA_TYPE_SEQUENCE) ||
	 (term->type == XML_SCHEMA_TYPE_CHOICE) ||
	 (term->type == XML_SCHEMA_TYPE_ALL)) &&
	 (term->children != NULL)) {
	xmlSchemaContentModelDump((xmlSchemaParticlePtr) term->children,
	    output, depth +1);
    }
    if (particle->next != NULL)
	xmlSchemaContentModelDump((xmlSchemaParticlePtr) particle->next,
		output, depth);
}

/**
 * xmlSchemaAttrUsesDump:
 * @uses:  attribute uses list
 * @output:  the file output
 *
 * Dumps a list of attribute use components.
 */
static void
xmlSchemaAttrUsesDump(xmlSchemaItemListPtr uses, FILE * output)
{
    xmlSchemaAttributeUsePtr use;
    xmlSchemaAttributeUseProhibPtr prohib;
    xmlSchemaQNameRefPtr ref;
    const xmlChar *name, *tns;
    xmlChar *str = NULL;
    int i;

    if ((uses == NULL) || (uses->nbItems == 0))
        return;

    fprintf(output, "  attributes:\n");
    for (i = 0; i < uses->nbItems; i++) {
	use = uses->items[i];
	if (use->type == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB) {
	    fprintf(output, "  [prohibition] ");
	    prohib = (xmlSchemaAttributeUseProhibPtr) use;
	    name = prohib->name;
	    tns = prohib->targetNamespace;
	} else if (use->type == XML_SCHEMA_EXTRA_QNAMEREF) {
	    fprintf(output, "  [reference] ");
	    ref = (xmlSchemaQNameRefPtr) use;
	    name = ref->name;
	    tns = ref->targetNamespace;
	} else {
	    fprintf(output, "  [use] ");
	    name = WXS_ATTRUSE_DECL_NAME(use);
	    tns = WXS_ATTRUSE_DECL_TNS(use);
	}
	fprintf(output, "'%s'\n",
	    (const char *) xmlSchemaFormatQName(&str, tns, name));
	FREE_AND_NULL(str);
    }
}

/**
 * xmlSchemaTypeDump:
 * @output:  the file output
 * @type:  a type structure
 *
 * Dump a SchemaType structure
 */
static void
xmlSchemaTypeDump(xmlSchemaTypePtr type, FILE * output)
{
    if (type == NULL) {
        fprintf(output, "Type: NULL\n");
        return;
    }
    fprintf(output, "Type: ");
    if (type->name != NULL)
        fprintf(output, "'%s' ", type->name);
    else
        fprintf(output, "(no name) ");
    if (type->targetNamespace != NULL)
	fprintf(output, "ns '%s' ", type->targetNamespace);
    switch (type->type) {
        case XML_SCHEMA_TYPE_BASIC:
            fprintf(output, "[basic] ");
            break;
        case XML_SCHEMA_TYPE_SIMPLE:
            fprintf(output, "[simple] ");
            break;
        case XML_SCHEMA_TYPE_COMPLEX:
            fprintf(output, "[complex] ");
            break;
        case XML_SCHEMA_TYPE_SEQUENCE:
            fprintf(output, "[sequence] ");
            break;
        case XML_SCHEMA_TYPE_CHOICE:
            fprintf(output, "[choice] ");
            break;
        case XML_SCHEMA_TYPE_ALL:
            fprintf(output, "[all] ");
            break;
        case XML_SCHEMA_TYPE_UR:
            fprintf(output, "[ur] ");
            break;
        case XML_SCHEMA_TYPE_RESTRICTION:
            fprintf(output, "[restriction] ");
            break;
        case XML_SCHEMA_TYPE_EXTENSION:
            fprintf(output, "[extension] ");
            break;
        default:
            fprintf(output, "[unknown type %d] ", type->type);
            break;
    }
    fprintf(output, "content: ");
    switch (type->contentType) {
        case XML_SCHEMA_CONTENT_UNKNOWN:
            fprintf(output, "[unknown] ");
            break;
        case XML_SCHEMA_CONTENT_EMPTY:
            fprintf(output, "[empty] ");
            break;
        case XML_SCHEMA_CONTENT_ELEMENTS:
            fprintf(output, "[element] ");
            break;
        case XML_SCHEMA_CONTENT_MIXED:
            fprintf(output, "[mixed] ");
            break;
        case XML_SCHEMA_CONTENT_MIXED_OR_ELEMENTS:
	/* not used. */
            break;
        case XML_SCHEMA_CONTENT_BASIC:
            fprintf(output, "[basic] ");
            break;
        case XML_SCHEMA_CONTENT_SIMPLE:
            fprintf(output, "[simple] ");
            break;
        case XML_SCHEMA_CONTENT_ANY:
            fprintf(output, "[any] ");
            break;
    }
    fprintf(output, "\n");
    if (type->base != NULL) {
        fprintf(output, "  base type: '%s'", type->base);
	if (type->baseNs != NULL)
	    fprintf(output, " ns '%s'\n", type->baseNs);
	else
	    fprintf(output, "\n");
    }
    if (type->attrUses != NULL)
	xmlSchemaAttrUsesDump(type->attrUses, output);
    if (type->annot != NULL)
        xmlSchemaAnnotDump(output, type->annot);
#ifdef DUMP_CONTENT_MODEL
    if ((type->type == XML_SCHEMA_TYPE_COMPLEX) &&
	(type->subtypes != NULL)) {
	xmlSchemaContentModelDump((xmlSchemaParticlePtr) type->subtypes,
	    output, 1);
    }
#endif
}

/**
 * xmlSchemaDump:
 * @output:  the file output
 * @schema:  a schema structure
 *
 * Dump a Schema structure.
 */
void
xmlSchemaDump(FILE * output, xmlSchemaPtr schema)
{
    if (output == NULL)
        return;
    if (schema == NULL) {
        fprintf(output, "Schemas: NULL\n");
        return;
    }
    fprintf(output, "Schemas: ");
    if (schema->name != NULL)
        fprintf(output, "%s, ", schema->name);
    else
        fprintf(output, "no name, ");
    if (schema->targetNamespace != NULL)
        fprintf(output, "%s", (const char *) schema->targetNamespace);
    else
        fprintf(output, "no target namespace");
    fprintf(output, "\n");
    if (schema->annot != NULL)
        xmlSchemaAnnotDump(output, schema->annot);
    xmlHashScan(schema->typeDecl, (xmlHashScanner) xmlSchemaTypeDump,
                output);
    xmlHashScanFull(schema->elemDecl,
                    (xmlHashScannerFull) xmlSchemaElementDump, output);
}

#ifdef DEBUG_IDC_NODE_TABLE
/**
 * xmlSchemaDebugDumpIDCTable:
 * @vctxt: the WXS validation context
 *
 * Displays the current IDC table for debug purposes.
 */
static void
xmlSchemaDebugDumpIDCTable(FILE * output,
			   const xmlChar *namespaceName,
			   const xmlChar *localName,
			   xmlSchemaPSVIIDCBindingPtr bind)
{
    xmlChar *str = NULL;
    const xmlChar *value;
    xmlSchemaPSVIIDCNodePtr tab;
    xmlSchemaPSVIIDCKeyPtr key;
    int i, j, res;

    fprintf(output, "IDC: TABLES on '%s'\n",
	xmlSchemaFormatQName(&str, namespaceName, localName));
    FREE_AND_NULL(str)

    if (bind == NULL)
	return;
    do {
	fprintf(output, "IDC:   BINDING '%s' (%d)\n",
	    xmlSchemaGetComponentQName(&str,
		bind->definition), bind->nbNodes);
	FREE_AND_NULL(str)
	for (i = 0; i < bind->nbNodes; i++) {
	    tab = bind->nodeTable[i];
	    fprintf(output, "         ( ");
	    for (j = 0; j < bind->definition->nbFields; j++) {
		key = tab->keys[j];
		if ((key != NULL) && (key->val != NULL)) {
		    res = xmlSchemaGetCanonValue(key->val, &value);
		    if (res >= 0)
			fprintf(output, "'%s' ", value);
		    else
			fprintf(output, "CANON-VALUE-FAILED ");
		    if (res == 0)
			FREE_AND_NULL(value)
		} else if (key != NULL)
		    fprintf(output, "(no val), ");
		else
		    fprintf(output, "(key missing), ");
	    }
	    fprintf(output, ")\n");
	}
	if (bind->dupls && bind->dupls->nbItems) {
	    fprintf(output, "IDC:     dupls (%d):\n", bind->dupls->nbItems);
	    for (i = 0; i < bind->dupls->nbItems; i++) {
		tab = bind->dupls->items[i];
		fprintf(output, "         ( ");
		for (j = 0; j < bind->definition->nbFields; j++) {
		    key = tab->keys[j];
		    if ((key != NULL) && (key->val != NULL)) {
			res = xmlSchemaGetCanonValue(key->val, &value);
			if (res >= 0)
			    fprintf(output, "'%s' ", value);
			else
			    fprintf(output, "CANON-VALUE-FAILED ");
			if (res == 0)
			    FREE_AND_NULL(value)
		    } else if (key != NULL)
		    fprintf(output, "(no val), ");
			else
			    fprintf(output, "(key missing), ");
		}
		fprintf(output, ")\n");
	    }
	}
	bind = bind->next;
    } while (bind != NULL);
}
#endif /* DEBUG_IDC */
#endif /* LIBXML_OUTPUT_ENABLED */

/************************************************************************
 *									*
 * 			Utilities					*
 *									*
 ************************************************************************/

/**
 * xmlSchemaGetPropNode:
 * @node: the element node
 * @name: the name of the attribute
 *
 * Seeks an attribute with a name of @name in
 * no namespace.
 *
 * Returns the attribute or NULL if not present.
 */
static xmlAttrPtr
xmlSchemaGetPropNode(xmlNodePtr node, const char *name)
{
    xmlAttrPtr prop;

    if ((node == NULL) || (name == NULL))
	return(NULL);
    prop = node->properties;
    while (prop != NULL) {
        if ((prop->ns == NULL) && xmlStrEqual(prop->name, BAD_CAST name))
	    return(prop);
	prop = prop->next;
    }
    return (NULL);
}

/**
 * xmlSchemaGetPropNodeNs:
 * @node: the element node
 * @uri: the uri
 * @name: the name of the attribute
 *
 * Seeks an attribute with a local name of @name and
 * a namespace URI of @uri.
 *
 * Returns the attribute or NULL if not present.
 */
static xmlAttrPtr
xmlSchemaGetPropNodeNs(xmlNodePtr node, const char *uri, const char *name)
{
    xmlAttrPtr prop;

    if ((node == NULL) || (name == NULL))
	return(NULL);
    prop = node->properties;
    while (prop != NULL) {
	if ((prop->ns != NULL) &&
	    xmlStrEqual(prop->name, BAD_CAST name) &&
	    xmlStrEqual(prop->ns->href, BAD_CAST uri))
	    return(prop);
	prop = prop->next;
    }
    return (NULL);
}

static const xmlChar *
xmlSchemaGetNodeContent(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node)
{
    xmlChar *val;
    const xmlChar *ret;

    val = xmlNodeGetContent(node);
    if (val == NULL)
	val = xmlStrdup((xmlChar *)"");
    ret = xmlDictLookup(ctxt->dict, val, -1);
    xmlFree(val);
    return(ret);
}

static const xmlChar *
xmlSchemaGetNodeContentNoDict(xmlNodePtr node)
{
    return((const xmlChar*) xmlNodeGetContent(node));
}

/**
 * xmlSchemaGetProp:
 * @ctxt: the parser context
 * @node: the node
 * @name: the property name
 *
 * Read a attribute value and internalize the string
 *
 * Returns the string or NULL if not present.
 */
static const xmlChar *
xmlSchemaGetProp(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
                 const char *name)
{
    xmlChar *val;
    const xmlChar *ret;

    val = xmlGetNoNsProp(node, BAD_CAST name);
    if (val == NULL)
        return(NULL);
    ret = xmlDictLookup(ctxt->dict, val, -1);
    xmlFree(val);
    return(ret);
}

/************************************************************************
 * 									*
 * 			Parsing functions				*
 * 									*
 ************************************************************************/

#define WXS_FIND_GLOBAL_ITEM(slot)			\
    if (xmlStrEqual(nsName, schema->targetNamespace)) { \
	ret = xmlHashLookup(schema->slot, name); \
	if (ret != NULL) goto exit; \
    } \
    if (xmlHashSize(schema->schemasImports) > 1) { \
	xmlSchemaImportPtr import; \
	if (nsName == NULL) \
	    import = xmlHashLookup(schema->schemasImports, \
		XML_SCHEMAS_NO_NAMESPACE); \
	else \
	    import = xmlHashLookup(schema->schemasImports, nsName); \
	if (import == NULL) \
	    goto exit; \
	ret = xmlHashLookup(import->schema->slot, name); \
    }

/**
 * xmlSchemaGetElem:
 * @schema:  the schema context
 * @name:  the element name
 * @ns:  the element namespace
 *
 * Lookup a global element declaration in the schema.
 *
 * Returns the element declaration or NULL if not found.
 */
static xmlSchemaElementPtr
xmlSchemaGetElem(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaElementPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return(NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(elemDecl)
    }
exit:
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup element decl. %s", name);
        else
            fprintf(stderr, "Unable to lookup element decl. %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetType:
 * @schema:  the main schema
 * @name:  the type's name
 * nsName:  the type's namespace
 *
 * Lookup a type in the schemas or the predefined types
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaTypePtr
xmlSchemaGetType(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaTypePtr ret = NULL;

    if (name == NULL)
        return (NULL);
    /* First try the built-in types. */
    if ((nsName != NULL) && xmlStrEqual(nsName, xmlSchemaNs)) {
	ret = xmlSchemaGetPredefinedType(name, nsName);
	if (ret != NULL)
	    goto exit;
	/*
	* Note that we try the parsed schemas as well here
	* since one might have parsed the S4S, which contain more
	* than the built-in types.
	* TODO: Can we optimize this?
	*/
    }
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(typeDecl)
    }
exit:

#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup type %s", name);
        else
            fprintf(stderr, "Unable to lookup type %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetAttributeDecl:
 * @schema:  the context of the schema
 * @name:  the name of the attribute
 * @ns:  the target namespace of the attribute
 *
 * Lookup a an attribute in the schema or imported schemas
 *
 * Returns the attribute declaration or NULL if not found.
 */
static xmlSchemaAttributePtr
xmlSchemaGetAttributeDecl(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaAttributePtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(attrDecl)
    }
exit:
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup attribute %s", name);
        else
            fprintf(stderr, "Unable to lookup attribute %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetAttributeGroup:
 * @schema:  the context of the schema
 * @name:  the name of the attribute group
 * @ns:  the target namespace of the attribute group
 *
 * Lookup a an attribute group in the schema or imported schemas
 *
 * Returns the attribute group definition or NULL if not found.
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaGetAttributeGroup(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaAttributeGroupPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(attrgrpDecl)
    }
exit:
    /* TODO:
    if ((ret != NULL) && (ret->redef != NULL)) {
	* Return the last redefinition. *
	ret = ret->redef;
    }
    */
#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup attribute group %s", name);
        else
            fprintf(stderr, "Unable to lookup attribute group %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

/**
 * xmlSchemaGetGroup:
 * @schema:  the context of the schema
 * @name:  the name of the group
 * @ns:  the target namespace of the group
 *
 * Lookup a group in the schema or imported schemas
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaGetGroup(xmlSchemaPtr schema, const xmlChar * name,
                 const xmlChar * nsName)
{
    xmlSchemaModelGroupDefPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(groupDecl)
    }
exit:

#ifdef DEBUG
    if (ret == NULL) {
        if (nsName == NULL)
            fprintf(stderr, "Unable to lookup group %s", name);
        else
            fprintf(stderr, "Unable to lookup group %s:%s", name,
                    nsName);
    }
#endif
    return (ret);
}

static xmlSchemaNotationPtr
xmlSchemaGetNotation(xmlSchemaPtr schema,
		     const xmlChar *name,
		     const xmlChar *nsName)
{
    xmlSchemaNotationPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(notaDecl)
    }
exit:
    return (ret);
}

static xmlSchemaIDCPtr
xmlSchemaGetIDC(xmlSchemaPtr schema,
		const xmlChar *name,
		const xmlChar *nsName)
{
    xmlSchemaIDCPtr ret = NULL;

    if ((name == NULL) || (schema == NULL))
        return (NULL);
    if (schema != NULL) {
	WXS_FIND_GLOBAL_ITEM(idcDef)
    }
exit:
    return (ret);
}

/**
 * xmlSchemaGetNamedComponent:
 * @schema:  the schema
 * @name:  the name of the group
 * @ns:  the target namespace of the group
 *
 * Lookup a group in the schema or imported schemas
 *
 * Returns the group definition or NULL if not found.
 */
static xmlSchemaBasicItemPtr
xmlSchemaGetNamedComponent(xmlSchemaPtr schema,
			   xmlSchemaTypeType itemType,
			   const xmlChar *name,
			   const xmlChar *targetNs)
{
    switch (itemType) {
	case XML_SCHEMA_TYPE_GROUP:
	    return ((xmlSchemaBasicItemPtr) xmlSchemaGetGroup(schema,
		name, targetNs));
	case XML_SCHEMA_TYPE_ELEMENT:
	    return ((xmlSchemaBasicItemPtr) xmlSchemaGetElem(schema,
		name, targetNs));
	default:
	    TODO
	    return (NULL);
    }
}

/************************************************************************
 * 									*
 * 			Parsing functions				*
 * 									*
 ************************************************************************/

#define IS_BLANK_NODE(n)						\
    (((n)->type == XML_TEXT_NODE) && (xmlSchemaIsBlank((n)->content, -1)))

/**
 * xmlSchemaIsBlank:
 * @str:  a string
 * @len: the length of the string or -1
 *
 * Check if a string is ignorable
 *
 * Returns 1 if the string is NULL or made of blanks chars, 0 otherwise
 */
static int
xmlSchemaIsBlank(xmlChar * str, int len)
{
    if (str == NULL)
        return (1);
    if (len < 0) {
	while (*str != 0) {
	    if (!(IS_BLANK_CH(*str)))
		return (0);
	    str++;
	}
    } else while ((*str != 0) && (len != 0)) {
	if (!(IS_BLANK_CH(*str)))
	    return (0);
	str++;
	len--;
    }

    return (1);
}

#define WXS_COMP_NAME(c, t) ((t) (c))->name
#define WXS_COMP_TNS(c, t) ((t) (c))->targetNamespace
/*
* xmlSchemaFindRedefCompInGraph:
* ATTENTION TODO: This uses pointer comp. for strings.
*/
static xmlSchemaBasicItemPtr
xmlSchemaFindRedefCompInGraph(xmlSchemaBucketPtr bucket,
			      xmlSchemaTypeType type,
			      const xmlChar *name,
			      const xmlChar *nsName)
{
    xmlSchemaBasicItemPtr ret;
    int i;

    if ((bucket == NULL) || (name == NULL))
	return(NULL);
    if ((bucket->globals == NULL) ||
	(bucket->globals->nbItems == 0))
	goto subschemas;
    /*
    * Search in global components.
    */
    for (i = 0; i < bucket->globals->nbItems; i++) {
	ret = bucket->globals->items[i];
	if (ret->type == type) {
	    switch (type) {
		case XML_SCHEMA_TYPE_COMPLEX:
		case XML_SCHEMA_TYPE_SIMPLE:
		    if ((WXS_COMP_NAME(ret, xmlSchemaTypePtr) == name) &&
			(WXS_COMP_TNS(ret, xmlSchemaTypePtr) ==
			nsName))
		    {
			return(ret);
		    }
		    break;
		case XML_SCHEMA_TYPE_GROUP:
		    if ((WXS_COMP_NAME(ret,
			    xmlSchemaModelGroupDefPtr) == name) &&
			(WXS_COMP_TNS(ret,
			    xmlSchemaModelGroupDefPtr) == nsName))
		    {
			return(ret);
		    }
		    break;
		case XML_SCHEMA_TYPE_ATTRIBUTEGROUP:
		    if ((WXS_COMP_NAME(ret,
			    xmlSchemaAttributeGroupPtr) == name) &&
			(WXS_COMP_TNS(ret,
			    xmlSchemaAttributeGroupPtr) == nsName))
		    {
			return(ret);
		    }
		    break;
		default:
		    /* Should not be hit. */
		    return(NULL);
	    }
	}
    }
subschemas:
    /*
    * Process imported/included schemas.
    */
    if (bucket->relations != NULL) {
	xmlSchemaSchemaRelationPtr rel = bucket->relations;

	/*
	* TODO: Marking the bucket will not avoid multiple searches
	* in the same schema, but avoids at least circularity.
	*/
	bucket->flags |= XML_SCHEMA_BUCKET_MARKED;
	do {
	    if ((rel->bucket != NULL) &&
		((rel->bucket->flags & XML_SCHEMA_BUCKET_MARKED) == 0)) {
		ret = xmlSchemaFindRedefCompInGraph(rel->bucket,
		    type, name, nsName);
		if (ret != NULL)
		    return(ret);
	    }
	    rel = rel->next;
	} while (rel != NULL);
	 bucket->flags ^= XML_SCHEMA_BUCKET_MARKED;
    }
    return(NULL);
}

/**
 * xmlSchemaAddNotation:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 *
 * Add an XML schema annotation declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaNotationPtr
xmlSchemaAddNotation(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                     const xmlChar *name, const xmlChar *nsName,
		     xmlNodePtr node ATTRIBUTE_UNUSED)
{
    xmlSchemaNotationPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaNotationPtr) xmlMalloc(sizeof(xmlSchemaNotation));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "add annotation", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaNotation));
    ret->type = XML_SCHEMA_TYPE_NOTATION;
    ret->name = name;
    ret->targetNamespace = nsName;
    /* TODO: do we need the node to be set?
    * ret->node = node;*/
    WXS_ADD_GLOBAL(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddAttribute:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributePtr
xmlSchemaAddAttribute(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                      const xmlChar * name, const xmlChar * nsName,
		      xmlNodePtr node, int topLevel)
{
    xmlSchemaAttributePtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaAttributePtr) xmlMalloc(sizeof(xmlSchemaAttribute));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating attribute", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttribute));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTE;
    ret->node = node;
    ret->name = name;
    ret->targetNamespace = nsName;

    if (topLevel)
	WXS_ADD_GLOBAL(ctxt, ret);
    else
	WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddAttributeUse:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributeUsePtr
xmlSchemaAddAttributeUse(xmlSchemaParserCtxtPtr pctxt,
			 xmlNodePtr node)
{
    xmlSchemaAttributeUsePtr ret = NULL;

    if (pctxt == NULL)
        return (NULL);

    ret = (xmlSchemaAttributeUsePtr) xmlMalloc(sizeof(xmlSchemaAttributeUse));
    if (ret == NULL) {
        xmlSchemaPErrMemory(pctxt, "allocating attribute", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeUse));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTE_USE;
    ret->node = node;

    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}

/*
* xmlSchemaAddRedef:
*
* Adds a redefinition information. This is used at a later stage to:
* resolve references to the redefined components and to check constraints.
*/
static xmlSchemaRedefPtr
xmlSchemaAddRedef(xmlSchemaParserCtxtPtr pctxt,
		  xmlSchemaBucketPtr targetBucket,
		  void *item,
		  const xmlChar *refName,
		  const xmlChar *refTargetNs)
{
    xmlSchemaRedefPtr ret;

    ret = (xmlSchemaRedefPtr)
	xmlMalloc(sizeof(xmlSchemaRedef));
    if (ret == NULL) {
	xmlSchemaPErrMemory(pctxt,
	    "allocating redefinition info", NULL);
	return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaRedef));
    ret->item = item;
    ret->targetBucket = targetBucket;
    ret->refName = refName;
    ret->refTargetNs = refTargetNs;
    if (WXS_CONSTRUCTOR(pctxt)->redefs == NULL)
	WXS_CONSTRUCTOR(pctxt)->redefs = ret;
    else
	WXS_CONSTRUCTOR(pctxt)->lastRedef->next = ret;
    WXS_CONSTRUCTOR(pctxt)->lastRedef = ret;

    return (ret);
}

/**
 * xmlSchemaAddAttributeGroupDefinition:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @nsName:  the target namespace
 * @node: the corresponding node
 *
 * Add an XML schema Attrribute Group definition.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaAddAttributeGroupDefinition(xmlSchemaParserCtxtPtr pctxt,
                           xmlSchemaPtr schema ATTRIBUTE_UNUSED,
			   const xmlChar *name,
			   const xmlChar *nsName,
			   xmlNodePtr node)
{
    xmlSchemaAttributeGroupPtr ret = NULL;

    if ((pctxt == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaAttributeGroupPtr)
        xmlMalloc(sizeof(xmlSchemaAttributeGroup));
    if (ret == NULL) {
	xmlSchemaPErrMemory(pctxt, "allocating attribute group", NULL);
	return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeGroup));
    ret->type = XML_SCHEMA_TYPE_ATTRIBUTEGROUP;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;

    /* TODO: Remove the flag. */
    ret->flags |= XML_SCHEMAS_ATTRGROUP_GLOBAL;
    if (pctxt->isRedefine) {
	pctxt->redef = xmlSchemaAddRedef(pctxt, pctxt->redefined,
	    ret, name, nsName);
	if (pctxt->redef == NULL) {
	    xmlFree(ret);
	    return(NULL);
	}
	pctxt->redefCounter = 0;
    }
    WXS_ADD_GLOBAL(pctxt, ret);
    WXS_ADD_PENDING(pctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddElement:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the type name
 * @namespace:  the type namespace
 *
 * Add an XML schema Element declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaElementPtr
xmlSchemaAddElement(xmlSchemaParserCtxtPtr ctxt,
                    const xmlChar * name, const xmlChar * nsName,
		    xmlNodePtr node, int topLevel)
{
    xmlSchemaElementPtr ret = NULL;

    if ((ctxt == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaElementPtr) xmlMalloc(sizeof(xmlSchemaElement));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating element", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaElement));
    ret->type = XML_SCHEMA_TYPE_ELEMENT;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;

    if (topLevel)
	WXS_ADD_GLOBAL(ctxt, ret);
    else
	WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddType:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @name:  the item name
 * @namespace:  the namespace
 *
 * Add an XML schema item
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaTypePtr
xmlSchemaAddType(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
		 xmlSchemaTypeType type,
                 const xmlChar * name, const xmlChar * nsName,
		 xmlNodePtr node, int topLevel)
{
    xmlSchemaTypePtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaTypePtr) xmlMalloc(sizeof(xmlSchemaType));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating type", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaType));
    ret->type = type;
    ret->name = name;
    ret->targetNamespace = nsName;
    ret->node = node;
    if (topLevel) {
	if (ctxt->isRedefine) {
	    ctxt->redef = xmlSchemaAddRedef(ctxt, ctxt->redefined,
		ret, name, nsName);
	    if (ctxt->redef == NULL) {
		xmlFree(ret);
		return(NULL);
	    }
	    ctxt->redefCounter = 0;
	}
	WXS_ADD_GLOBAL(ctxt, ret);
    } else
	WXS_ADD_LOCAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

static xmlSchemaQNameRefPtr
xmlSchemaNewQNameRef(xmlSchemaParserCtxtPtr pctxt,
		     xmlSchemaTypeType refType,
		     const xmlChar *refName,
		     const xmlChar *refNs)
{
    xmlSchemaQNameRefPtr ret;

    ret = (xmlSchemaQNameRefPtr)
	xmlMalloc(sizeof(xmlSchemaQNameRef));
    if (ret == NULL) {
	xmlSchemaPErrMemory(pctxt,
	    "allocating QName reference item", NULL);
	return (NULL);
    }
    ret->node = NULL;
    ret->type = XML_SCHEMA_EXTRA_QNAMEREF;
    ret->name = refName;
    ret->targetNamespace = refNs;
    ret->item = NULL;
    ret->itemType = refType;
    /*
    * Store the reference item in the schema.
    */
    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}

static xmlSchemaAttributeUseProhibPtr
xmlSchemaAddAttributeUseProhib(xmlSchemaParserCtxtPtr pctxt)
{
    xmlSchemaAttributeUseProhibPtr ret;

    ret = (xmlSchemaAttributeUseProhibPtr)
	xmlMalloc(sizeof(xmlSchemaAttributeUseProhib));
    if (ret == NULL) {
	xmlSchemaPErrMemory(pctxt,
	    "allocating attribute use prohibition", NULL);
	return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaAttributeUseProhib));
    ret->type = XML_SCHEMA_EXTRA_ATTR_USE_PROHIB;
    WXS_ADD_LOCAL(pctxt, ret);
    return (ret);
}


/**
 * xmlSchemaAddModelGroup:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @type: the "compositor" type of the model group
 * @node: the node in the schema doc
 *
 * Adds a schema model group
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaModelGroupPtr
xmlSchemaAddModelGroup(xmlSchemaParserCtxtPtr ctxt,
		       xmlSchemaPtr schema,
		       xmlSchemaTypeType type,
		       xmlNodePtr node)
{
    xmlSchemaModelGroupPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaModelGroupPtr)
	xmlMalloc(sizeof(xmlSchemaModelGroup));
    if (ret == NULL) {
	xmlSchemaPErrMemory(ctxt, "allocating model group component",
	    NULL);
	return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaModelGroup));
    ret->type = type;
    ret->node = node;
    WXS_ADD_LOCAL(ctxt, ret);
    if ((type == XML_SCHEMA_TYPE_SEQUENCE) ||
	(type == XML_SCHEMA_TYPE_CHOICE))
	WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}


/**
 * xmlSchemaAddParticle:
 * @ctxt:  a schema parser context
 * @schema:  the schema being built
 * @node: the corresponding node in the schema doc
 * @min: the minOccurs
 * @max: the maxOccurs
 *
 * Adds an XML schema particle component.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaParticlePtr
xmlSchemaAddParticle(xmlSchemaParserCtxtPtr ctxt,
		     xmlNodePtr node, int min, int max)
{
    xmlSchemaParticlePtr ret = NULL;
    if (ctxt == NULL)
        return (NULL);

#ifdef DEBUG
    fprintf(stderr, "Adding particle component\n");
#endif
    ret = (xmlSchemaParticlePtr)
	xmlMalloc(sizeof(xmlSchemaParticle));
    if (ret == NULL) {
	xmlSchemaPErrMemory(ctxt, "allocating particle component",
	    NULL);
	return (NULL);
    }
    ret->type = XML_SCHEMA_TYPE_PARTICLE;
    ret->annot = NULL;
    ret->node = node;
    ret->minOccurs = min;
    ret->maxOccurs = max;
    ret->next = NULL;
    ret->children = NULL;

    WXS_ADD_LOCAL(ctxt, ret);
    /*
    * Note that addition to pending components will be done locally
    * to the specific parsing function, since the most particles
    * need not to be fixed up (i.e. the reference to be resolved).
    * REMOVED: WXS_ADD_PENDING(ctxt, ret);
    */
    return (ret);
}

/**
 * xmlSchemaAddModelGroupDefinition:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @name:  the group name
 *
 * Add an XML schema Group definition
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaAddModelGroupDefinition(xmlSchemaParserCtxtPtr ctxt,
				 xmlSchemaPtr schema,
				 const xmlChar *name,
				 const xmlChar *nsName,
				 xmlNodePtr node)
{
    xmlSchemaModelGroupDefPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaModelGroupDefPtr)
	xmlMalloc(sizeof(xmlSchemaModelGroupDef));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "adding group", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaModelGroupDef));
    ret->name = name;
    ret->type = XML_SCHEMA_TYPE_GROUP;
    ret->node = node;
    ret->targetNamespace = nsName;

    if (ctxt->isRedefine) {
	ctxt->redef = xmlSchemaAddRedef(ctxt, ctxt->redefined,
	    ret, name, nsName);
	if (ctxt->redef == NULL) {
	    xmlFree(ret);
	    return(NULL);
	}
	ctxt->redefCounter = 0;
    }
    WXS_ADD_GLOBAL(ctxt, ret);
    WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaNewWildcardNs:
 * @ctxt:  a schema validation context
 *
 * Creates a new wildcard namespace constraint.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaWildcardNsPtr
xmlSchemaNewWildcardNsConstraint(xmlSchemaParserCtxtPtr ctxt)
{
    xmlSchemaWildcardNsPtr ret;

    ret = (xmlSchemaWildcardNsPtr)
	xmlMalloc(sizeof(xmlSchemaWildcardNs));
    if (ret == NULL) {
	xmlSchemaPErrMemory(ctxt, "creating wildcard namespace constraint", NULL);
	return (NULL);
    }
    ret->value = NULL;
    ret->next = NULL;
    return (ret);
}

static xmlSchemaIDCPtr
xmlSchemaAddIDC(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                  const xmlChar *name, const xmlChar *nsName,
		  int category, xmlNodePtr node)
{
    xmlSchemaIDCPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (name == NULL))
        return (NULL);

    ret = (xmlSchemaIDCPtr) xmlMalloc(sizeof(xmlSchemaIDC));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt,
	    "allocating an identity-constraint definition", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaIDC));
    /* The target namespace of the parent element declaration. */
    ret->targetNamespace = nsName;
    ret->name = name;
    ret->type = category;
    ret->node = node;

    WXS_ADD_GLOBAL(ctxt, ret);
    /*
    * Only keyrefs need to be fixup up.
    */
    if (category == XML_SCHEMA_TYPE_IDC_KEYREF)
	WXS_ADD_PENDING(ctxt, ret);
    return (ret);
}

/**
 * xmlSchemaAddWildcard:
 * @ctxt:  a schema validation context
 * @schema: a schema
 *
 * Adds a wildcard.
 * It corresponds to a xsd:anyAttribute and xsd:any.
 *
 * Returns the new struture or NULL in case of error
 */
static xmlSchemaWildcardPtr
xmlSchemaAddWildcard(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
		     xmlSchemaTypeType type, xmlNodePtr node)
{
    xmlSchemaWildcardPtr ret = NULL;

    if ((ctxt == NULL) || (schema == NULL))
        return (NULL);

    ret = (xmlSchemaWildcardPtr) xmlMalloc(sizeof(xmlSchemaWildcard));
    if (ret == NULL) {
        xmlSchemaPErrMemory(ctxt, "adding wildcard", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaWildcard));
    ret->type = type;
    ret->node = node;
    WXS_ADD_LOCAL(ctxt, ret);
    return (ret);
}

static void
xmlSchemaSubstGroupFree(xmlSchemaSubstGroupPtr group)
{
    if (group == NULL)
	return;
    if (group->members != NULL)
	xmlSchemaItemListFree(group->members);
    xmlFree(group);
}

static xmlSchemaSubstGroupPtr
xmlSchemaSubstGroupAdd(xmlSchemaParserCtxtPtr pctxt,
		       xmlSchemaElementPtr head)
{
    xmlSchemaSubstGroupPtr ret;

    /* Init subst group hash. */
    if (WXS_SUBST_GROUPS(pctxt) == NULL) {
	WXS_SUBST_GROUPS(pctxt) = xmlHashCreateDict(10, pctxt->dict);
	if (WXS_SUBST_GROUPS(pctxt) == NULL)
	    return(NULL);
    }
    /* Create a new substitution group. */
    ret = (xmlSchemaSubstGroupPtr) xmlMalloc(sizeof(xmlSchemaSubstGroup));
    if (ret == NULL) {
	xmlSchemaPErrMemory(NULL,
	    "allocating a substitution group container", NULL);
	return(NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaSubstGroup));
    ret->head = head;
    /* Create list of members. */
    ret->members = xmlSchemaItemListCreate();
    if (ret->members == NULL) {
	xmlSchemaSubstGroupFree(ret);
	return(NULL);
    }
    /* Add subst group to hash. */
    if (xmlHashAddEntry2(WXS_SUBST_GROUPS(pctxt),
	head->name, head->targetNamespace, ret) != 0) {
	PERROR_INT("xmlSchemaSubstGroupAdd",
	    "failed to add a new substitution container");
	xmlSchemaSubstGroupFree(ret);
	return(NULL);
    }
    return(ret);
}

static xmlSchemaSubstGroupPtr
xmlSchemaSubstGroupGet(xmlSchemaParserCtxtPtr pctxt,
		       xmlSchemaElementPtr head)
{
    if (WXS_SUBST_GROUPS(pctxt) == NULL)
	return(NULL);
    return(xmlHashLookup2(WXS_SUBST_GROUPS(pctxt),
	head->name, head->targetNamespace));

}

/**
 * xmlSchemaAddElementSubstitutionMember:
 * @pctxt:  a schema parser context
 * @head:  the head of the substitution group
 * @member: the new member of the substitution group
 *
 * Allocate a new annotation structure.
 *
 * Returns the newly allocated structure or NULL in case or error
 */
static int
xmlSchemaAddElementSubstitutionMember(xmlSchemaParserCtxtPtr pctxt,
				      xmlSchemaElementPtr head,
				      xmlSchemaElementPtr member)
{
    xmlSchemaSubstGroupPtr substGroup = NULL;

    if ((pctxt == NULL) || (head == NULL) || (member == NULL))
	return (-1);

    substGroup = xmlSchemaSubstGroupGet(pctxt, head);
    if (substGroup == NULL)
	substGroup = xmlSchemaSubstGroupAdd(pctxt, head);
    if (substGroup == NULL)
	return(-1);
    if (xmlSchemaItemListAdd(substGroup->members, member) == -1)
	return(-1);
    return(0);
}

/************************************************************************
 * 									*
 *		Utilities for parsing					*
 * 									*
 ************************************************************************/

/**
 * xmlSchemaPValAttrNodeQNameValue:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the parent as a schema object
 * @value:  the QName value
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts the local name and the URI of a QName value and validates it.
 * This one is intended to be used on attribute values that
 * should resolve to schema components.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeQNameValue(xmlSchemaParserCtxtPtr ctxt,
				       xmlSchemaPtr schema,
				       xmlSchemaBasicItemPtr ownerItem,
				       xmlAttrPtr attr,
				       const xmlChar *value,
				       const xmlChar **uri,
				       const xmlChar **local)
{
    const xmlChar *pref;
    xmlNsPtr ns;
    int len, ret;

    *uri = NULL;
    *local = NULL;
    ret = xmlValidateQName(value, 1);
    if (ret > 0) {
	xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    ownerItem, (xmlNodePtr) attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME),
	    NULL, value, NULL, NULL, NULL);
	*local = value;
	return (ctxt->err);
    } else if (ret < 0)
	return (-1);

    if (!strchr((char *) value, ':')) {
	ns = xmlSearchNs(attr->doc, attr->parent, NULL);
	if (ns)
	    *uri = xmlDictLookup(ctxt->dict, ns->href, -1);
	else if (schema->flags & XML_SCHEMAS_INCLUDING_CONVERT_NS) {
	    /* TODO: move XML_SCHEMAS_INCLUDING_CONVERT_NS to the
	    * parser context. */
	    /*
	    * This one takes care of included schemas with no
	    * target namespace.
	    */
	    *uri = ctxt->targetNamespace;
	}
	*local = xmlDictLookup(ctxt->dict, value, -1);
	return (0);
    }
    /*
    * At this point xmlSplitQName3 has to return a local name.
    */
    *local = xmlSplitQName3(value, &len);
    *local = xmlDictLookup(ctxt->dict, *local, -1);
    pref = xmlDictLookup(ctxt->dict, value, len);
    ns = xmlSearchNs(attr->doc, attr->parent, pref);
    if (ns == NULL) {
	xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    ownerItem, (xmlNodePtr) attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_QNAME), NULL, value,
	    "The value '%s' of simple type 'xs:QName' has no "
	    "corresponding namespace declaration in scope", value, NULL);
	return (ctxt->err);
    } else {
        *uri = xmlDictLookup(ctxt->dict, ns->href, -1);
    }
    return (0);
}

/**
 * xmlSchemaPValAttrNodeQName:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the owner element
 * @ownerItem: the owner as a schema object
 * @attr:  the attribute node
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts and validates the QName of an attribute value.
 * This one is intended to be used on attribute values that
 * should resolve to schema components.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeQName(xmlSchemaParserCtxtPtr ctxt,
				       xmlSchemaPtr schema,
				       xmlSchemaBasicItemPtr ownerItem,
				       xmlAttrPtr attr,
				       const xmlChar **uri,
				       const xmlChar **local)
{
    const xmlChar *value;

    value = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    return (xmlSchemaPValAttrNodeQNameValue(ctxt, schema,
	ownerItem, attr, value, uri, local));
}

/**
 * xmlSchemaPValAttrQName:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the owner as a schema object
 * @ownerElem:  the parent node of the attribute
 * @name:  the name of the attribute
 * @local: the resulting local part if found, the attribute value otherwise
 * @uri:  the resulting namespace URI if found
 *
 * Extracts and validates the QName of an attribute value.
 *
 * Returns 0, in case the QName is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrQName(xmlSchemaParserCtxtPtr ctxt,
				   xmlSchemaPtr schema,
				   xmlSchemaBasicItemPtr ownerItem,
				   xmlNodePtr ownerElem,
				   const char *name,
				   const xmlChar **uri,
				   const xmlChar **local)
{
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(ownerElem, name);
    if (attr == NULL) {
	*local = NULL;
	*uri = NULL;
	return (0);
    }
    return (xmlSchemaPValAttrNodeQName(ctxt, schema,
	ownerItem, attr, uri, local));
}

/**
 * xmlSchemaPValAttrID:
 * @ctxt:  a schema parser context
 * @schema: the schema context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the owner as a schema object
 * @ownerElem:  the parent node of the attribute
 * @name:  the name of the attribute
 *
 * Extracts and validates the ID of an attribute value.
 *
 * Returns 0, in case the ID is valid, a positive error code
 * if not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaPValAttrNodeID(xmlSchemaParserCtxtPtr ctxt, xmlAttrPtr attr)
{
    int ret;
    const xmlChar *value;

    if (attr == NULL)
	return(0);
    value = xmlSchemaGetNodeContentNoDict((xmlNodePtr) attr);
    ret = xmlValidateNCName(value, 1);
    if (ret == 0) {
	/*
	* NOTE: the IDness might have already be declared in the DTD
	*/
	if (attr->atype != XML_ATTRIBUTE_ID) {
	    xmlIDPtr res;
	    xmlChar *strip;

	    /*
	    * TODO: Use xmlSchemaStrip here; it's not exported at this
	    * moment.
	    */
	    strip = xmlSchemaCollapseString(value);
	    if (strip != NULL) {
		xmlFree((xmlChar *) value);
		value = strip;
	    }
    	    res = xmlAddID(NULL, attr->doc, value, attr);
	    if (res == NULL) {
		ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
		xmlSchemaPSimpleTypeErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		    NULL, (xmlNodePtr) attr,
		    xmlSchemaGetBuiltInType(XML_SCHEMAS_ID),
		    NULL, NULL, "Duplicate value '%s' of simple "
		    "type 'xs:ID'", value, NULL);
	    } else
		attr->atype = XML_ATTRIBUTE_ID;
	}
    } else if (ret > 0) {
	ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
	xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    NULL, (xmlNodePtr) attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_ID),
	    NULL, NULL, "The value '%s' of simple type 'xs:ID' is "
	    "not a valid 'xs:NCName'",
	    value, NULL);
    }
    if (value != NULL)
	xmlFree((xmlChar *)value);

    return (ret);
}

static int
xmlSchemaPValAttrID(xmlSchemaParserCtxtPtr ctxt,
		    xmlNodePtr ownerElem,
		    const xmlChar *name)
{
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(ownerElem, (const char *) name);
    if (attr == NULL)
	return(0);
    return(xmlSchemaPValAttrNodeID(ctxt, attr));

}

/**
 * xmlGetMaxOccurs:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 *
 * Get the maxOccurs property
 *
 * Returns the default if not found, or the value
 */
static int
xmlGetMaxOccurs(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
		int min, int max, int def, const char *expected)
{
    const xmlChar *val, *cur;
    int ret = 0;
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(node, "maxOccurs");
    if (attr == NULL)
	return (def);
    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);

    if (xmlStrEqual(val, (const xmlChar *) "unbounded")) {
	if (max != UNBOUNDED) {
	    xmlSchemaPSimpleTypeErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		/* XML_SCHEMAP_INVALID_MINOCCURS, */
		NULL, (xmlNodePtr) attr, NULL, expected,
		val, NULL, NULL, NULL);
	    return (def);
	} else
	    return (UNBOUNDED);  /* encoding it with -1 might be another option */
    }

    cur = val;
    while (IS_BLANK_CH(*cur))
        cur++;
    if (*cur == 0) {
        xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    /* XML_SCHEMAP_INVALID_MINOCCURS, */
	    NULL, (xmlNodePtr) attr, NULL, expected,
	    val, NULL, NULL, NULL);
	return (def);
    }
    while ((*cur >= '0') && (*cur <= '9')) {
        ret = ret * 10 + (*cur - '0');
        cur++;
    }
    while (IS_BLANK_CH(*cur))
        cur++;
    /*
    * TODO: Restrict the maximal value to Integer.
    */
    if ((*cur != 0) || (ret < min) || ((max != -1) && (ret > max))) {
	xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    /* XML_SCHEMAP_INVALID_MINOCCURS, */
	    NULL, (xmlNodePtr) attr, NULL, expected,
	    val, NULL, NULL, NULL);
        return (def);
    }
    return (ret);
}

/**
 * xmlGetMinOccurs:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 *
 * Get the minOccurs property
 *
 * Returns the default if not found, or the value
 */
static int
xmlGetMinOccurs(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node,
		int min, int max, int def, const char *expected)
{
    const xmlChar *val, *cur;
    int ret = 0;
    xmlAttrPtr attr;

    attr = xmlSchemaGetPropNode(node, "minOccurs");
    if (attr == NULL)
	return (def);
    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    cur = val;
    while (IS_BLANK_CH(*cur))
        cur++;
    if (*cur == 0) {
        xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    /* XML_SCHEMAP_INVALID_MINOCCURS, */
	    NULL, (xmlNodePtr) attr, NULL, expected,
	    val, NULL, NULL, NULL);
        return (def);
    }
    while ((*cur >= '0') && (*cur <= '9')) {
        ret = ret * 10 + (*cur - '0');
        cur++;
    }
    while (IS_BLANK_CH(*cur))
        cur++;
    /*
    * TODO: Restrict the maximal value to Integer.
    */
    if ((*cur != 0) || (ret < min) || ((max != -1) && (ret > max))) {
	xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    /* XML_SCHEMAP_INVALID_MINOCCURS, */
	    NULL, (xmlNodePtr) attr, NULL, expected,
	    val, NULL, NULL, NULL);
        return (def);
    }
    return (ret);
}

/**
 * xmlSchemaPGetBoolNodeValue:
 * @ctxt:  a schema validation context
 * @ownerDes:  owner designation
 * @ownerItem:  the owner as a schema item
 * @node: the node holding the value
 *
 * Converts a boolean string value into 1 or 0.
 *
 * Returns 0 or 1.
 */
static int
xmlSchemaPGetBoolNodeValue(xmlSchemaParserCtxtPtr ctxt,
			   xmlSchemaBasicItemPtr ownerItem,
			   xmlNodePtr node)
{
    xmlChar *value = NULL;
    int res = 0;

    value = xmlNodeGetContent(node);
    /*
    * 3.2.2.1 Lexical representation
    * An instance of a datatype that is defined as boolean
    * can have the following legal literals {true, false, 1, 0}.
    */
    if (xmlStrEqual(BAD_CAST value, BAD_CAST "true"))
        res = 1;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "false"))
        res = 0;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "1"))
	res = 1;
    else if (xmlStrEqual(BAD_CAST value, BAD_CAST "0"))
        res = 0;
    else {
        xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_INVALID_BOOLEAN,
	    ownerItem, node,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_BOOLEAN),
	    NULL, BAD_CAST value,
	    NULL, NULL, NULL);
    }
    if (value != NULL)
	xmlFree(value);
    return (res);
}

/**
 * xmlGetBooleanProp:
 * @ctxt:  a schema validation context
 * @node:  a subtree containing XML Schema informations
 * @name:  the attribute name
 * @def:  the default value
 *
 * Evaluate if a boolean property is set
 *
 * Returns the default if not found, 0 if found to be false,
 * 1 if found to be true
 */
static int
xmlGetBooleanProp(xmlSchemaParserCtxtPtr ctxt,
		  xmlNodePtr node,
                  const char *name, int def)
{
    const xmlChar *val;

    val = xmlSchemaGetProp(ctxt, node, name);
    if (val == NULL)
        return (def);
    /*
    * 3.2.2.1 Lexical representation
    * An instance of a datatype that is defined as boolean
    * can have the following legal literals {true, false, 1, 0}.
    */
    if (xmlStrEqual(val, BAD_CAST "true"))
        def = 1;
    else if (xmlStrEqual(val, BAD_CAST "false"))
        def = 0;
    else if (xmlStrEqual(val, BAD_CAST "1"))
	def = 1;
    else if (xmlStrEqual(val, BAD_CAST "0"))
        def = 0;
    else {
        xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_INVALID_BOOLEAN,
	    NULL,
	    (xmlNodePtr) xmlSchemaGetPropNode(node, name),
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_BOOLEAN),
	    NULL, val, NULL, NULL, NULL);
    }
    return (def);
}

/************************************************************************
 * 									*
 *		Shema extraction from an Infoset			*
 * 									*
 ************************************************************************/
static xmlSchemaTypePtr xmlSchemaParseSimpleType(xmlSchemaParserCtxtPtr
                                                 ctxt, xmlSchemaPtr schema,
                                                 xmlNodePtr node,
						 int topLevel);
static xmlSchemaTypePtr xmlSchemaParseComplexType(xmlSchemaParserCtxtPtr
                                                  ctxt,
                                                  xmlSchemaPtr schema,
                                                  xmlNodePtr node,
						  int topLevel);
static xmlSchemaTypePtr xmlSchemaParseRestriction(xmlSchemaParserCtxtPtr
                                                  ctxt,
                                                  xmlSchemaPtr schema,
                                                  xmlNodePtr node,
						  xmlSchemaTypeType parentType);
static xmlSchemaBasicItemPtr
xmlSchemaParseLocalAttribute(xmlSchemaParserCtxtPtr pctxt,
			     xmlSchemaPtr schema,
			     xmlNodePtr node,
			     xmlSchemaItemListPtr uses,
			     int parentType);
static xmlSchemaTypePtr xmlSchemaParseList(xmlSchemaParserCtxtPtr ctxt,
                                           xmlSchemaPtr schema,
                                           xmlNodePtr node);
static xmlSchemaWildcardPtr
xmlSchemaParseAnyAttribute(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaPtr schema, xmlNodePtr node);

/**
 * xmlSchemaPValAttrNodeValue:
 *
 * @ctxt:  a schema parser context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @attr:  the schema attribute node being validated
 * @value: the value
 * @type: the built-in type to be validated against
 *
 * Validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttrNodeValue(xmlSchemaParserCtxtPtr pctxt,
			   xmlSchemaBasicItemPtr ownerItem,
			   xmlAttrPtr attr,
			   const xmlChar *value,
			   xmlSchemaTypePtr type)
{

    int ret = 0;

    /*
    * NOTE: Should we move this to xmlschematypes.c? Hmm, but this
    * one is really meant to be used internally, so better not.
    */
    if ((pctxt == NULL) || (type == NULL) || (attr == NULL))
	return (-1);
    if (type->type != XML_SCHEMA_TYPE_BASIC) {
	PERROR_INT("xmlSchemaPValAttrNodeValue",
	    "the given type is not a built-in type");
	return (-1);
    }
    switch (type->builtInType) {
	case XML_SCHEMAS_NCNAME:
	case XML_SCHEMAS_QNAME:
	case XML_SCHEMAS_ANYURI:
	case XML_SCHEMAS_TOKEN:
	case XML_SCHEMAS_LANGUAGE:
	    ret = xmlSchemaValPredefTypeNode(type, value, NULL,
		(xmlNodePtr) attr);
	    break;
	default: {
	    PERROR_INT("xmlSchemaPValAttrNodeValue",
		"validation using the given type is not supported while "
		"parsing a schema");
	    return (-1);
	}
    }
    /*
    * TODO: Should we use the S4S error codes instead?
    */
    if (ret < 0) {
	PERROR_INT("xmlSchemaPValAttrNodeValue",
	    "failed to validate a schema attribute value");
	return (-1);
    } else if (ret > 0) {
	if (WXS_IS_LIST(type))
	    ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_2;
	else
	    ret = XML_SCHEMAV_CVC_DATATYPE_VALID_1_2_1;
	xmlSchemaPSimpleTypeErr(pctxt,
	    ret, ownerItem, (xmlNodePtr) attr,
	    type, NULL, value, NULL, NULL, NULL);
    }
    return (ret);
}

/**
 * xmlSchemaPValAttrNode:
 *
 * @ctxt:  a schema parser context
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @attr:  the schema attribute node being validated
 * @type: the built-in type to be validated against
 * @value: the resulting value if any
 *
 * Extracts and validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttrNode(xmlSchemaParserCtxtPtr ctxt,
			   xmlSchemaBasicItemPtr ownerItem,
			   xmlAttrPtr attr,
			   xmlSchemaTypePtr type,
			   const xmlChar **value)
{
    const xmlChar *val;

    if ((ctxt == NULL) || (type == NULL) || (attr == NULL))
	return (-1);

    val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    if (value != NULL)
	*value = val;

    return (xmlSchemaPValAttrNodeValue(ctxt, ownerItem, attr,
	val, type));
}

/**
 * xmlSchemaPValAttr:
 *
 * @ctxt:  a schema parser context
 * @node: the element node of the attribute
 * @ownerDes: the designation of the parent element
 * @ownerItem: the schema object owner if existent
 * @ownerElem: the owner element node
 * @name:  the name of the schema attribute node
 * @type: the built-in type to be validated against
 * @value: the resulting value if any
 *
 * Extracts and validates a value against the given built-in type.
 * This one is intended to be used internally for validation
 * of schema attribute values during parsing of the schema.
 *
 * Returns 0 if the value is valid, a positive error code
 * number otherwise and -1 in case of an internal or API error.
 */
static int
xmlSchemaPValAttr(xmlSchemaParserCtxtPtr ctxt,
		       xmlSchemaBasicItemPtr ownerItem,
		       xmlNodePtr ownerElem,
		       const char *name,
		       xmlSchemaTypePtr type,
		       const xmlChar **value)
{
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (type == NULL)) {
	if (value != NULL)
	    *value = NULL;
	return (-1);
    }
    if (type->type != XML_SCHEMA_TYPE_BASIC) {
	if (value != NULL)
	    *value = NULL;
	xmlSchemaPErr(ctxt, ownerElem,
	    XML_SCHEMAP_INTERNAL,
	    "Internal error: xmlSchemaPValAttr, the given "
	    "type '%s' is not a built-in type.\n",
	    type->name, NULL);
	return (-1);
    }
    attr = xmlSchemaGetPropNode(ownerElem, name);
    if (attr == NULL) {
	if (value != NULL)
	    *value = NULL;
	return (0);
    }
    return (xmlSchemaPValAttrNode(ctxt, ownerItem, attr,
	type, value));
}

static int
xmlSchemaCheckReference(xmlSchemaParserCtxtPtr pctxt,
		  xmlSchemaPtr schema ATTRIBUTE_UNUSED,
		  xmlNodePtr node,
		  xmlAttrPtr attr,
		  const xmlChar *namespaceName)
{
    /* TODO: Pointer comparison instead? */
    if (xmlStrEqual(pctxt->targetNamespace, namespaceName))
	return (0);
    if (xmlStrEqual(xmlSchemaNs, namespaceName))
	return (0);
    /*
    * Check if the referenced namespace was <import>ed.
    */
    if (WXS_BUCKET(pctxt)->relations != NULL) {
	xmlSchemaSchemaRelationPtr rel;

	rel = WXS_BUCKET(pctxt)->relations;
	do {
	    if (WXS_IS_BUCKET_IMPMAIN(rel->type) &&
		xmlStrEqual(namespaceName, rel->importNamespace))
		return (0);
	    rel = rel->next;
	} while (rel != NULL);
    }
    /*
    * No matching <import>ed namespace found.
    */
    {
	xmlNodePtr n = (attr != NULL) ? (xmlNodePtr) attr : node;

	if (namespaceName == NULL)
	    xmlSchemaCustomErr(ACTXT_CAST pctxt,
		XML_SCHEMAP_SRC_RESOLVE, n, NULL,
		"References from this schema to components in no "
		"namespace are not allowed, since not indicated by an "
		"import statement", NULL, NULL);
	else
	    xmlSchemaCustomErr(ACTXT_CAST pctxt,
		XML_SCHEMAP_SRC_RESOLVE, n, NULL,
		"References from this schema to components in the "
		"namespace '%s' are not allowed, since not indicated by an "
		"import statement", namespaceName, NULL);
    }
    return (XML_SCHEMAP_SRC_RESOLVE);
}

/**
 * xmlSchemaParseLocalAttributes:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 * @type:  the hosting type where the attributes will be anchored
 *
 * Parses attribute uses and attribute declarations and
 * attribute group references.
 */
static int
xmlSchemaParseLocalAttributes(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                        xmlNodePtr *child, xmlSchemaItemListPtr *list,
			int parentType, int *hasRefs)
{
    void *item;

    while ((IS_SCHEMA((*child), "attribute")) ||
           (IS_SCHEMA((*child), "attributeGroup"))) {
        if (IS_SCHEMA((*child), "attribute")) {
	    item = xmlSchemaParseLocalAttribute(ctxt, schema, *child,
		*list, parentType);
        } else {
            item = xmlSchemaParseAttributeGroupRef(ctxt, schema, *child);
	    if ((item != NULL) && (hasRefs != NULL))
		*hasRefs = 1;
        }
	if (item != NULL) {
	    if (*list == NULL) {
		/* TODO: Customize grow factor. */
		*list = xmlSchemaItemListCreate();
		if (*list == NULL)
		    return(-1);
	    }
	    if (xmlSchemaItemListAddSize(*list, 2, item) == -1)
		return(-1);
	}
        *child = (*child)->next;
    }
    return (0);
}

/**
 * xmlSchemaParseAnnotation:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaAnnotPtr
xmlSchemaParseAnnotation(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr node, int needed)
{
    xmlSchemaAnnotPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    int barked = 0;

    /*
    * INFO: S4S completed.
    */
    /*
    * id = ID
    * {any attributes with non-schema namespace . . .}>
    * Content: (appinfo | documentation)*
    */
    if ((ctxt == NULL) || (node == NULL))
        return (NULL);
    if (needed)
	ret = xmlSchemaNewAnnot(ctxt, node);
    else
	ret = NULL;
    attr = node->properties;
    while (attr != NULL) {
	if (((attr->ns == NULL) &&
	    (!xmlStrEqual(attr->name, BAD_CAST "id"))) ||
	    ((attr->ns != NULL) &&
	    xmlStrEqual(attr->ns->href, xmlSchemaNs))) {

	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    while (child != NULL) {
	if (IS_SCHEMA(child, "appinfo")) {
	    /* TODO: make available the content of "appinfo". */
	    /*
	    * source = anyURI
	    * {any attributes with non-schema namespace . . .}>
	    * Content: ({any})*
	    */
	    attr = child->properties;
	    while (attr != NULL) {
		if (((attr->ns == NULL) &&
		     (!xmlStrEqual(attr->name, BAD_CAST "source"))) ||
		     ((attr->ns != NULL) &&
		      xmlStrEqual(attr->ns->href, xmlSchemaNs))) {

		    xmlSchemaPIllegalAttrErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		}
		attr = attr->next;
	    }
	    xmlSchemaPValAttr(ctxt, NULL, child, "source",
		xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI), NULL);
	    child = child->next;
	} else if (IS_SCHEMA(child, "documentation")) {
	    /* TODO: make available the content of "documentation". */
	    /*
	    * source = anyURI
	    * {any attributes with non-schema namespace . . .}>
	    * Content: ({any})*
	    */
	    attr = child->properties;
	    while (attr != NULL) {
		if (attr->ns == NULL) {
		    if (!xmlStrEqual(attr->name, BAD_CAST "source")) {
			xmlSchemaPIllegalAttrErr(ctxt,
			    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		    }
		} else {
		    if (xmlStrEqual(attr->ns->href, xmlSchemaNs) ||
			(xmlStrEqual(attr->name, BAD_CAST "lang") &&
			(!xmlStrEqual(attr->ns->href, XML_XML_NAMESPACE)))) {

			xmlSchemaPIllegalAttrErr(ctxt,
			    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		    }
		}
		attr = attr->next;
	    }
	    /*
	    * Attribute "xml:lang".
	    */
	    attr = xmlSchemaGetPropNodeNs(child, (const char *) XML_XML_NAMESPACE, "lang");
	    if (attr != NULL)
		xmlSchemaPValAttrNode(ctxt, NULL, attr,
		xmlSchemaGetBuiltInType(XML_SCHEMAS_LANGUAGE), NULL);
	    child = child->next;
	} else {
	    if (!barked)
		xmlSchemaPContentErr(ctxt,
		    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		    NULL, node, child, NULL, "(appinfo | documentation)*");
	    barked = 1;
	    child = child->next;
	}
    }

    return (ret);
}

/**
 * xmlSchemaParseFacet:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Facet declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the new type structure or NULL in case of error
 */
static xmlSchemaFacetPtr
xmlSchemaParseFacet(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                    xmlNodePtr node)
{
    xmlSchemaFacetPtr facet;
    xmlNodePtr child = NULL;
    const xmlChar *value;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    facet = xmlSchemaNewFacet();
    if (facet == NULL) {
        xmlSchemaPErrMemory(ctxt, "allocating facet", node);
        return (NULL);
    }
    facet->node = node;
    value = xmlSchemaGetProp(ctxt, node, "value");
    if (value == NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_FACET_NO_VALUE,
                       "Facet %s has no value\n", node->name, NULL);
        xmlSchemaFreeFacet(facet);
        return (NULL);
    }
    if (IS_SCHEMA(node, "minInclusive")) {
        facet->type = XML_SCHEMA_FACET_MININCLUSIVE;
    } else if (IS_SCHEMA(node, "minExclusive")) {
        facet->type = XML_SCHEMA_FACET_MINEXCLUSIVE;
    } else if (IS_SCHEMA(node, "maxInclusive")) {
        facet->type = XML_SCHEMA_FACET_MAXINCLUSIVE;
    } else if (IS_SCHEMA(node, "maxExclusive")) {
        facet->type = XML_SCHEMA_FACET_MAXEXCLUSIVE;
    } else if (IS_SCHEMA(node, "totalDigits")) {
        facet->type = XML_SCHEMA_FACET_TOTALDIGITS;
    } else if (IS_SCHEMA(node, "fractionDigits")) {
        facet->type = XML_SCHEMA_FACET_FRACTIONDIGITS;
    } else if (IS_SCHEMA(node, "pattern")) {
        facet->type = XML_SCHEMA_FACET_PATTERN;
    } else if (IS_SCHEMA(node, "enumeration")) {
        facet->type = XML_SCHEMA_FACET_ENUMERATION;
    } else if (IS_SCHEMA(node, "whiteSpace")) {
        facet->type = XML_SCHEMA_FACET_WHITESPACE;
    } else if (IS_SCHEMA(node, "length")) {
        facet->type = XML_SCHEMA_FACET_LENGTH;
    } else if (IS_SCHEMA(node, "maxLength")) {
        facet->type = XML_SCHEMA_FACET_MAXLENGTH;
    } else if (IS_SCHEMA(node, "minLength")) {
        facet->type = XML_SCHEMA_FACET_MINLENGTH;
    } else {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_UNKNOWN_FACET_TYPE,
                       "Unknown facet type %s\n", node->name, NULL);
        xmlSchemaFreeFacet(facet);
        return (NULL);
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    facet->value = value;
    if ((facet->type != XML_SCHEMA_FACET_PATTERN) &&
	(facet->type != XML_SCHEMA_FACET_ENUMERATION)) {
	const xmlChar *fixed;

	fixed = xmlSchemaGetProp(ctxt, node, "fixed");
	if (fixed != NULL) {
	    if (xmlStrEqual(fixed, BAD_CAST "true"))
		facet->fixed = 1;
	}
    }
    child = node->children;

    if (IS_SCHEMA(child, "annotation")) {
        facet->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_UNKNOWN_FACET_CHILD,
                       "Facet %s has unexpected child content\n",
                       node->name, NULL);
    }
    return (facet);
}

/**
 * xmlSchemaParseWildcardNs:
 * @ctxt:  a schema parser context
 * @wildc:  the wildcard, already created
 * @node:  a subtree containing XML Schema informations
 *
 * Parses the attribute "processContents" and "namespace"
 * of a xsd:anyAttribute and xsd:any.
 * *WARNING* this interface is highly subject to change
 *
 * Returns 0 if everything goes fine, a positive error code
 * if something is not valid and -1 if an internal error occurs.
 */
static int
xmlSchemaParseWildcardNs(xmlSchemaParserCtxtPtr ctxt,
			 xmlSchemaPtr schema ATTRIBUTE_UNUSED,
			 xmlSchemaWildcardPtr wildc,
			 xmlNodePtr node)
{
    const xmlChar *pc, *ns, *dictnsItem;
    int ret = 0;
    xmlChar *nsItem;
    xmlSchemaWildcardNsPtr tmp, lastNs = NULL;
    xmlAttrPtr attr;

    pc = xmlSchemaGetProp(ctxt, node, "processContents");
    if ((pc == NULL)
        || (xmlStrEqual(pc, (const xmlChar *) "strict"))) {
        wildc->processContents = XML_SCHEMAS_ANY_STRICT;
    } else if (xmlStrEqual(pc, (const xmlChar *) "skip")) {
        wildc->processContents = XML_SCHEMAS_ANY_SKIP;
    } else if (xmlStrEqual(pc, (const xmlChar *) "lax")) {
        wildc->processContents = XML_SCHEMAS_ANY_LAX;
    } else {
        xmlSchemaPSimpleTypeErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    NULL, node,
	    NULL, "(strict | skip | lax)", pc,
	    NULL, NULL, NULL);
        wildc->processContents = XML_SCHEMAS_ANY_STRICT;
	ret = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
    }
    /*
     * Build the namespace constraints.
     */
    attr = xmlSchemaGetPropNode(node, "namespace");
    ns = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
    if ((attr == NULL) || (xmlStrEqual(ns, BAD_CAST "##any")))
	wildc->any = 1;
    else if (xmlStrEqual(ns, BAD_CAST "##other")) {
	wildc->negNsSet = xmlSchemaNewWildcardNsConstraint(ctxt);
	if (wildc->negNsSet == NULL) {
	    return (-1);
	}
	wildc->negNsSet->value = ctxt->targetNamespace;
    } else {
	const xmlChar *end, *cur;

	cur = ns;
	do {
	    while (IS_BLANK_CH(*cur))
		cur++;
	    end = cur;
	    while ((*end != 0) && (!(IS_BLANK_CH(*end))))
		end++;
	    if (end == cur)
		break;
	    nsItem = xmlStrndup(cur, end - cur);
	    if ((xmlStrEqual(nsItem, BAD_CAST "##other")) ||
		    (xmlStrEqual(nsItem, BAD_CAST "##any"))) {
		xmlSchemaPSimpleTypeErr(ctxt,
		    XML_SCHEMAP_WILDCARD_INVALID_NS_MEMBER,
		    NULL, (xmlNodePtr) attr,
		    NULL,
		    "((##any | ##other) | List of (xs:anyURI | "
		    "(##targetNamespace | ##local)))",
		    nsItem, NULL, NULL, NULL);
		ret = XML_SCHEMAP_WILDCARD_INVALID_NS_MEMBER;
	    } else {
		if (xmlStrEqual(nsItem, BAD_CAST "##targetNamespace")) {
		    dictnsItem = ctxt->targetNamespace;
		} else if (xmlStrEqual(nsItem, BAD_CAST "##local")) {
		    dictnsItem = NULL;
		} else {
		    /*
		    * Validate the item (anyURI).
		    */
		    xmlSchemaPValAttrNodeValue(ctxt, NULL, attr,
			nsItem, xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI));
		    dictnsItem = xmlDictLookup(ctxt->dict, nsItem, -1);
		}
		/*
		* Avoid dublicate namespaces.
		*/
		tmp = wildc->nsSet;
		while (tmp != NULL) {
		    if (dictnsItem == tmp->value)
			break;
		    tmp = tmp->next;
		}
		if (tmp == NULL) {
		    tmp = xmlSchemaNewWildcardNsConstraint(ctxt);
		    if (tmp == NULL) {
			xmlFree(nsItem);
			return (-1);
		    }
		    tmp->value = dictnsItem;
		    tmp->next = NULL;
		    if (wildc->nsSet == NULL)
			wildc->nsSet = tmp;
		    else
			lastNs->next = tmp;
		    lastNs = tmp;
		}

	    }
	    xmlFree(nsItem);
	    cur = end;
	} while (*cur != 0);
    }
    return (ret);
}

static int
xmlSchemaPCheckParticleCorrect_2(xmlSchemaParserCtxtPtr ctxt,
				 xmlSchemaParticlePtr item ATTRIBUTE_UNUSED,
				 xmlNodePtr node,
				 int minOccurs,
				 int maxOccurs) {

    if ((maxOccurs == 0) && ( minOccurs == 0))
	return (0);
    if (maxOccurs != UNBOUNDED) {
	/*
	* TODO: Maybe we should better not create the particle,
	* if min/max is invalid, since it could confuse the build of the
	* content model.
	*/
	/*
	* 3.9.6 Schema Component Constraint: Particle Correct
	*
	*/
	if (maxOccurs < 1) {
	    /*
	    * 2.2 {max occurs} must be greater than or equal to 1.
	    */
	    xmlSchemaPCustomAttrErr(ctxt,
		XML_SCHEMAP_P_PROPS_CORRECT_2_2,
		NULL, NULL,
		xmlSchemaGetPropNode(node, "maxOccurs"),
		"The value must be greater than or equal to 1");
	    return (XML_SCHEMAP_P_PROPS_CORRECT_2_2);
	} else if (minOccurs > maxOccurs) {
	    /*
	    * 2.1 {min occurs} must not be greater than {max occurs}.
	    */
	    xmlSchemaPCustomAttrErr(ctxt,
		XML_SCHEMAP_P_PROPS_CORRECT_2_1,
		NULL, NULL,
		xmlSchemaGetPropNode(node, "minOccurs"),
		"The value must not be greater than the value of 'maxOccurs'");
	    return (XML_SCHEMAP_P_PROPS_CORRECT_2_1);
	}
    }
    return (0);
}

/**
 * xmlSchemaParseAny:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parsea a XML schema <any> element. A particle and wildcard
 * will be created (except if minOccurs==maxOccurs==0, in this case
 * nothing will be created).
 * *WARNING* this interface is highly subject to change
 *
 * Returns the particle or NULL in case of error or if minOccurs==maxOccurs==0
 */
static xmlSchemaParticlePtr
xmlSchemaParseAny(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                  xmlNodePtr node)
{
    xmlSchemaParticlePtr particle;
    xmlNodePtr child = NULL;
    xmlSchemaWildcardPtr wild;
    int min, max;
    xmlAttrPtr attr;
    xmlSchemaAnnotPtr annot = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "maxOccurs")) &&
	        (!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "processContents"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * minOccurs/maxOccurs.
    */
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1,
	"(xs:nonNegativeInteger | unbounded)");
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1,
	"xs:nonNegativeInteger");
    xmlSchemaPCheckParticleCorrect_2(ctxt, NULL, node, min, max);
    /*
    * Create & parse the wildcard.
    */
    wild = xmlSchemaAddWildcard(ctxt, schema, XML_SCHEMA_TYPE_ANY, node);
    if (wild == NULL)
	return (NULL);
    xmlSchemaParseWildcardNs(ctxt, schema, wild, node);
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child,
	    NULL, "(annotation?)");
    }
    /*
    * No component if minOccurs==maxOccurs==0.
    */
    if ((min == 0) && (max == 0)) {
	/* Don't free the wildcard, since it's already on the list. */
	return (NULL);
    }
    /*
    * Create the particle.
    */
    particle = xmlSchemaAddParticle(ctxt, node, min, max);
    if (particle == NULL)
        return (NULL);
    particle->annot = annot;
    particle->children = (xmlSchemaTreeItemPtr) wild;

    return (particle);
}

/**
 * xmlSchemaParseNotation:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Notation declaration
 *
 * Returns the new structure or NULL in case of error
 */
static xmlSchemaNotationPtr
xmlSchemaParseNotation(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                       xmlNodePtr node)
{
    const xmlChar *name;
    xmlSchemaNotationPtr ret;
    xmlNodePtr child = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    name = xmlSchemaGetProp(ctxt, node, "name");
    if (name == NULL) {
        xmlSchemaPErr2(ctxt, node, child, XML_SCHEMAP_NOTATION_NO_NAME,
                       "Notation has no name\n", NULL, NULL);
        return (NULL);
    }
    ret = xmlSchemaAddNotation(ctxt, schema, name,
	ctxt->targetNamespace, node);
    if (ret == NULL)
        return (NULL);
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child,
	    NULL, "(annotation?)");
    }

    return (ret);
}

/**
 * xmlSchemaParseAnyAttribute:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema AnyAttrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns a wildcard or NULL.
 */
static xmlSchemaWildcardPtr
xmlSchemaParseAnyAttribute(xmlSchemaParserCtxtPtr ctxt,
                           xmlSchemaPtr schema, xmlNodePtr node)
{
    xmlSchemaWildcardPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    ret = xmlSchemaAddWildcard(ctxt, schema, XML_SCHEMA_TYPE_ANY_ATTRIBUTE,
	node);
    if (ret == NULL) {
        return (NULL);
    }
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
	        (!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "processContents"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * Parse the namespace list.
    */
    if (xmlSchemaParseWildcardNs(ctxt, schema, ret, node) != 0)
	return (NULL);
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child,
	    NULL, "(annotation?)");
    }

    return (ret);
}


/**
 * xmlSchemaParseAttribute:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attrribute declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute declaration.
 */
static xmlSchemaBasicItemPtr
xmlSchemaParseLocalAttribute(xmlSchemaParserCtxtPtr pctxt,
			     xmlSchemaPtr schema,
			     xmlNodePtr node,
			     xmlSchemaItemListPtr uses,
			     int parentType)
{
    const xmlChar *attrValue, *name = NULL, *ns = NULL;
    xmlSchemaAttributeUsePtr use = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *tmpNs = NULL, *tmpName = NULL, *defValue = NULL;
    int isRef = 0, occurs = XML_SCHEMAS_ATTR_USE_OPTIONAL;
    int	nberrors, hasForm = 0, defValueType = 0;

#define WXS_ATTR_DEF_VAL_DEFAULT 1
#define WXS_ATTR_DEF_VAL_FIXED 2

    /*
     * 3.2.3 Constraints on XML Representations of Attribute Declarations
     */

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr != NULL) {
	if (xmlSchemaPValAttrNodeQName(pctxt, schema,
	    NULL, attr, &tmpNs, &tmpName) != 0) {
	    return (NULL);
	}
	if (xmlSchemaCheckReference(pctxt, schema, node, attr, tmpNs) != 0)
	    return(NULL);
	isRef = 1;
    }
    nberrors = pctxt->nberrors;
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if (isRef) {
		if (xmlStrEqual(attr->name, BAD_CAST "id")) {
		    xmlSchemaPValAttrNodeID(pctxt, attr);
		    goto attr_next;
		} else if (xmlStrEqual(attr->name, BAD_CAST "ref")) {
		    goto attr_next;
		}
	    } else {
		if (xmlStrEqual(attr->name, BAD_CAST "name")) {
		    goto attr_next;
		} else if (xmlStrEqual(attr->name, BAD_CAST "id")) {
		    xmlSchemaPValAttrNodeID(pctxt, attr);
		    goto attr_next;
		} else if (xmlStrEqual(attr->name, BAD_CAST "type")) {
		    xmlSchemaPValAttrNodeQName(pctxt, schema, NULL,
			attr, &tmpNs, &tmpName);
		    goto attr_next;
		} else if (xmlStrEqual(attr->name, BAD_CAST "form")) {
		    /*
		    * Evaluate the target namespace
		    */
		    hasForm = 1;
		    attrValue = xmlSchemaGetNodeContent(pctxt,
			(xmlNodePtr) attr);
		    if (xmlStrEqual(attrValue, BAD_CAST "qualified")) {
			ns = pctxt->targetNamespace;
		    } else if (!xmlStrEqual(attrValue, BAD_CAST "unqualified"))
		    {
			xmlSchemaPSimpleTypeErr(pctxt,
			    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
			    NULL, (xmlNodePtr) attr,
			    NULL, "(qualified | unqualified)",
			    attrValue, NULL, NULL, NULL);
		    }
		    goto attr_next;
		}
	    }
	    if (xmlStrEqual(attr->name, BAD_CAST "use")) {

		attrValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
		/* TODO: Maybe we need to normalize the value beforehand. */
		if (xmlStrEqual(attrValue, BAD_CAST "optional"))
		    occurs = XML_SCHEMAS_ATTR_USE_OPTIONAL;
		else if (xmlStrEqual(attrValue, BAD_CAST "prohibited"))
		    occurs = XML_SCHEMAS_ATTR_USE_PROHIBITED;
		else if (xmlStrEqual(attrValue, BAD_CAST "required"))
		    occurs = XML_SCHEMAS_ATTR_USE_REQUIRED;
		else {
		    xmlSchemaPSimpleTypeErr(pctxt,
			XML_SCHEMAP_INVALID_ATTR_USE,
			NULL, (xmlNodePtr) attr,
			NULL, "(optional | prohibited | required)",
			attrValue, NULL, NULL, NULL);
		}
		goto attr_next;
	    } else if (xmlStrEqual(attr->name, BAD_CAST "default")) {
		/*
		* 3.2.3 : 1
		* default and fixed must not both be present.
		*/
		if (defValue) {
		    xmlSchemaPMutualExclAttrErr(pctxt,
			XML_SCHEMAP_SRC_ATTRIBUTE_1,
			NULL, attr, "default", "fixed");
		} else {
		    defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
		    defValueType = WXS_ATTR_DEF_VAL_DEFAULT;
		}
		goto attr_next;
	    } else if (xmlStrEqual(attr->name, BAD_CAST "fixed")) {
		/*
		* 3.2.3 : 1
		* default and fixed must not both be present.
		*/
		if (defValue) {
		    xmlSchemaPMutualExclAttrErr(pctxt,
			XML_SCHEMAP_SRC_ATTRIBUTE_1,
			NULL, attr, "default", "fixed");
		} else {
		    defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
		    defValueType = WXS_ATTR_DEF_VAL_FIXED;
		}
		goto attr_next;
	    }
	} else if (! xmlStrEqual(attr->ns->href, xmlSchemaNs))
	    goto attr_next;

	xmlSchemaPIllegalAttrErr(pctxt,
	    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);

attr_next:
	attr = attr->next;
    }
    /*
    * 3.2.3 : 2
    * If default and use are both present, use must have
    * the actual value optional.
    */
    if ((defValueType == WXS_ATTR_DEF_VAL_DEFAULT) &&
	(occurs != XML_SCHEMAS_ATTR_USE_OPTIONAL)) {
	xmlSchemaPSimpleTypeErr(pctxt,
	    XML_SCHEMAP_SRC_ATTRIBUTE_2,
	    NULL, node, NULL,
	    "(optional | prohibited | required)", NULL,
	    "The value of the attribute 'use' must be 'optional' "
	    "if the attribute 'default' is present",
	    NULL, NULL);
    }
    /*
    * We want correct attributes.
    */
    if (nberrors != pctxt->nberrors)
	return(NULL);
    if (! isRef) {
	xmlSchemaAttributePtr attrDecl;

	/* TODO: move XML_SCHEMAS_QUALIF_ATTR to the parser. */
	if ((! hasForm) && (schema->flags & XML_SCHEMAS_QUALIF_ATTR))
	    ns = pctxt->targetNamespace;
	/*
	* 3.2.6 Schema Component Constraint: xsi: Not Allowed
	* TODO: Move this to the component layer.
	*/
	if (xmlStrEqual(ns, xmlSchemaInstanceNs)) {
	    xmlSchemaCustomErr(ACTXT_CAST pctxt,
		XML_SCHEMAP_NO_XSI,
		node, NULL,
		"The target namespace must not match '%s'",
		xmlSchemaInstanceNs, NULL);
	}
	attr = xmlSchemaGetPropNode(node, "name");
	if (attr == NULL) {
	    xmlSchemaPMissingAttrErr(pctxt, XML_SCHEMAP_S4S_ATTR_MISSING,
		NULL, node, "name", NULL);
	    return (NULL);
	}
	if (xmlSchemaPValAttrNode(pctxt, NULL, attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
	    return (NULL);
	}
	/*
	* 3.2.6 Schema Component Constraint: xmlns Not Allowed
	* TODO: Move this to the component layer.
	*/
	if (xmlStrEqual(name, BAD_CAST "xmlns")) {
	    xmlSchemaPSimpleTypeErr(pctxt,
		XML_SCHEMAP_NO_XMLNS,
		NULL, (xmlNodePtr) attr,
		xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), NULL, NULL,
		"The value of the attribute must not match 'xmlns'",
		NULL, NULL);
	    return (NULL);
	}
	if (occurs == XML_SCHEMAS_ATTR_USE_PROHIBITED)
	    goto check_children;
	/*
	* Create the attribute use component.
	*/
	use = xmlSchemaAddAttributeUse(pctxt, node);
	if (use == NULL)
	    return(NULL);
	use->occurs = occurs;
	/*
	* Create the attribute declaration.
	*/
	attrDecl = xmlSchemaAddAttribute(pctxt, schema, name, ns, node, 0);
	if (attrDecl == NULL)
	    return (NULL);
	if (tmpName != NULL) {
	    attrDecl->typeName = tmpName;
	    attrDecl->typeNs = tmpNs;
	}
	use->attrDecl = attrDecl;
	/*
	* Value constraint.
	*/
	if (defValue != NULL) {
	    attrDecl->defValue = defValue;
	    if (defValueType == WXS_ATTR_DEF_VAL_FIXED)
		attrDecl->flags |= XML_SCHEMAS_ATTR_FIXED;
	}
    } else if (occurs != XML_SCHEMAS_ATTR_USE_PROHIBITED) {
	xmlSchemaQNameRefPtr ref;

	/*
	* Create the attribute use component.
	*/
	use = xmlSchemaAddAttributeUse(pctxt, node);
	if (use == NULL)
	    return(NULL);
	/*
	* We need to resolve the reference at later stage.
	*/
	WXS_ADD_PENDING(pctxt, use);
	use->occurs = occurs;
	/*
	* Create a QName reference to the attribute declaration.
	*/
	ref = xmlSchemaNewQNameRef(pctxt, XML_SCHEMA_TYPE_ATTRIBUTE,
	    tmpName, tmpNs);
	if (ref == NULL)
	    return(NULL);
	/*
	* Assign the reference. This will be substituted for the
	* referenced attribute declaration when the QName is resolved.
	*/
	use->attrDecl = WXS_ATTR_CAST ref;
	/*
	* Value constraint.
	*/
	if (defValue != NULL)
	    use->defValue = defValue;
	    if (defValueType == WXS_ATTR_DEF_VAL_FIXED)
		use->flags |= XML_SCHEMA_ATTR_USE_FIXED;
    }

check_children:
    /*
    * And now for the children...
    */
    child = node->children;
    if (occurs == XML_SCHEMAS_ATTR_USE_PROHIBITED) {
	xmlSchemaAttributeUseProhibPtr prohib;

	if (IS_SCHEMA(child, "annotation")) {
	    xmlSchemaParseAnnotation(pctxt, child, 0);
	    child = child->next;
	}
	if (child != NULL) {
	    xmlSchemaPContentErr(pctxt,
		XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, node, child, NULL,
		"(annotation?)");
	}
	/*
	* Check for pointlessness of attribute prohibitions.
	*/
	if (parentType == XML_SCHEMA_TYPE_ATTRIBUTEGROUP) {
	    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
		XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
		node, NULL,
		"Skipping attribute use prohibition, since it is "
		"pointless inside an <attributeGroup>",
		NULL, NULL, NULL);
	    return(NULL);
	} else if (parentType == XML_SCHEMA_TYPE_EXTENSION) {
	    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
		XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
		node, NULL,
		"Skipping attribute use prohibition, since it is "
		"pointless when extending a type",
		NULL, NULL, NULL);
	    return(NULL);
	}
	if (! isRef) {
	    tmpName = name;
	    tmpNs = ns;
	}
	/*
	* Check for duplicate attribute prohibitions.
	*/
	if (uses) {
	    int i;

	    for (i = 0; i < uses->nbItems; i++) {
		use = uses->items[i];
		if ((use->type == XML_SCHEMA_EXTRA_ATTR_USE_PROHIB) &&
		    (tmpName == (WXS_ATTR_PROHIB_CAST use)->name) &&
		    (tmpNs == (WXS_ATTR_PROHIB_CAST use)->targetNamespace))
		{
		    xmlChar *str = NULL;

		    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
			XML_SCHEMAP_WARN_ATTR_POINTLESS_PROH,
			node, NULL,
			"Skipping duplicate attribute use prohibition '%s'",
			xmlSchemaFormatQName(&str, tmpNs, tmpName),
			NULL, NULL);
		    FREE_AND_NULL(str)
		    return(NULL);
		}
	    }
	}
	/*
	* Create the attribute prohibition helper component.
	*/
	prohib = xmlSchemaAddAttributeUseProhib(pctxt);
	if (prohib == NULL)
	    return(NULL);
	prohib->node = node;
	prohib->name = tmpName;
	prohib->targetNamespace = tmpNs;
	if (isRef) {
	    /*
	    * We need at least to resolve to the attribute declaration.
	    */
	    WXS_ADD_PENDING(pctxt, prohib);
	}
	return(WXS_BASIC_CAST prohib);
    } else {
	if (IS_SCHEMA(child, "annotation")) {
	    /*
	    * TODO: Should this go into the attr decl?
	    */
	    use->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
	    child = child->next;
	}
	if (isRef) {
	    if (child != NULL) {
		if (IS_SCHEMA(child, "simpleType"))
		    /*
		    * 3.2.3 : 3.2
		    * If ref is present, then all of <simpleType>,
		    * form and type must be absent.
		    */
		    xmlSchemaPContentErr(pctxt,
			XML_SCHEMAP_SRC_ATTRIBUTE_3_2,
			NULL, node, child, NULL,
			"(annotation?)");
		else
		    xmlSchemaPContentErr(pctxt,
			XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
			NULL, node, child, NULL,
			"(annotation?)");
	    }
	} else {
	    if (IS_SCHEMA(child, "simpleType")) {
		if (WXS_ATTRUSE_DECL(use)->typeName != NULL) {
		    /*
		    * 3.2.3 : 4
		    * type and <simpleType> must not both be present.
		    */
		    xmlSchemaPContentErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_4,
			NULL, node, child,
			"The attribute 'type' and the <simpleType> child "
			"are mutually exclusive", NULL);
		} else
		    WXS_ATTRUSE_TYPEDEF(use) =
			xmlSchemaParseSimpleType(pctxt, schema, child, 0);
		child = child->next;
	    }
	    if (child != NULL)
		xmlSchemaPContentErr(pctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, node, child, NULL,
		"(annotation?, simpleType?)");
	}
    }
    return (WXS_BASIC_CAST use);
}


static xmlSchemaAttributePtr
xmlSchemaParseGlobalAttribute(xmlSchemaParserCtxtPtr pctxt,
			      xmlSchemaPtr schema,
			      xmlNodePtr node)
{
    const xmlChar *attrValue;
    xmlSchemaAttributePtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    /*
     * Note that the w3c spec assumes the schema to be validated with schema
     * for schemas beforehand.
     *
     * 3.2.3 Constraints on XML Representations of Attribute Declarations
     */
    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /*
    * 3.2.3 : 3.1
    * One of ref or name must be present, but not both
    */
    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(pctxt, XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node, "name", NULL);
	return (NULL);
    }
    if (xmlSchemaPValAttrNode(pctxt, NULL, attr,
	xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &attrValue) != 0) {
	return (NULL);
    }
    /*
    * 3.2.6 Schema Component Constraint: xmlns Not Allowed
    * TODO: Move this to the component layer.
    */
    if (xmlStrEqual(attrValue, BAD_CAST "xmlns")) {
	xmlSchemaPSimpleTypeErr(pctxt,
	    XML_SCHEMAP_NO_XMLNS,
	    NULL, (xmlNodePtr) attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), NULL, NULL,
	    "The value of the attribute must not match 'xmlns'",
	    NULL, NULL);
	return (NULL);
    }
    /*
    * 3.2.6 Schema Component Constraint: xsi: Not Allowed
    * TODO: Move this to the component layer.
    *       Or better leave it here and add it to the component layer
    *       if we have a schema construction API.
    */
    if (xmlStrEqual(pctxt->targetNamespace, xmlSchemaInstanceNs)) {
	xmlSchemaCustomErr(ACTXT_CAST pctxt,
	    XML_SCHEMAP_NO_XSI, node, NULL,
	    "The target namespace must not match '%s'",
	    xmlSchemaInstanceNs, NULL);
    }

    ret = xmlSchemaAddAttribute(pctxt, schema, attrValue,
	pctxt->targetNamespace, node, 1);
    if (ret == NULL)
	return (NULL);
    ret->flags |= XML_SCHEMAS_ATTR_GLOBAL;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "default")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "fixed")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "type")))
	    {
		xmlSchemaPIllegalAttrErr(pctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(pctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrQName(pctxt, schema, NULL,
	node, "type", &ret->typeNs, &ret->typeName);

    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");
    /*
    * Attribute "fixed".
    */
    ret->defValue = xmlSchemaGetProp(pctxt, node, "fixed");
    if (ret->defValue != NULL)
	ret->flags |= XML_SCHEMAS_ATTR_FIXED;
    /*
    * Attribute "default".
    */
    attr = xmlSchemaGetPropNode(node, "default");
    if (attr != NULL) {
	/*
	* 3.2.3 : 1
	* default and fixed must not both be present.
	*/
	if (ret->flags & XML_SCHEMAS_ATTR_FIXED) {
	    xmlSchemaPMutualExclAttrErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_1,
		WXS_BASIC_CAST ret, attr, "default", "fixed");
	} else
	    ret->defValue = xmlSchemaGetNodeContent(pctxt, (xmlNodePtr) attr);
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
	if (ret->typeName != NULL) {
	    /*
	    * 3.2.3 : 4
	    * type and <simpleType> must not both be present.
	    */
	    xmlSchemaPContentErr(pctxt, XML_SCHEMAP_SRC_ATTRIBUTE_4,
		NULL, node, child,
		"The attribute 'type' and the <simpleType> child "
		"are mutually exclusive", NULL);
	} else
	    ret->subtypes = xmlSchemaParseSimpleType(pctxt, schema, child, 0);
	child = child->next;
    }
    if (child != NULL)
	xmlSchemaPContentErr(pctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?, simpleType?)");

    return (ret);
}

/**
 * xmlSchemaParseAttributeGroupRef:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parse an attribute group definition reference.
 * Note that a reference to an attribute group does not
 * correspond to any component at all.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute group or NULL in case of error.
 */
static xmlSchemaQNameRefPtr
xmlSchemaParseAttributeGroupRef(xmlSchemaParserCtxtPtr pctxt,
				xmlSchemaPtr schema,
				xmlNodePtr node)
{
    xmlSchemaQNameRefPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *refNs = NULL, *ref = NULL;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(pctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node, "ref", NULL);
	return (NULL);
    }
    xmlSchemaPValAttrNodeQName(pctxt, schema,
	NULL, attr, &refNs, &ref);
    if (xmlSchemaCheckReference(pctxt, schema, node, attr, refNs) != 0)
	return(NULL);

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "ref")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "id")))
	    {
		xmlSchemaPIllegalAttrErr(pctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(pctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    /* Attribute ID */
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");

    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	/*
	* TODO: We do not have a place to store the annotation, do we?
	*/
        xmlSchemaParseAnnotation(pctxt, child, 0);
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(pctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?)");
    }

    /*
    * Handle attribute group redefinitions.
    */
    if (pctxt->isRedefine && pctxt->redef &&
	(pctxt->redef->item->type ==
	    XML_SCHEMA_TYPE_ATTRIBUTEGROUP) &&
	(ref == pctxt->redef->refName) &&
	(refNs == pctxt->redef->refTargetNs))
    {
	/*
	* SPEC src-redefine:
	* (7.1) "If it has an <attributeGroup> among its contents
	* the actual value of whose ref [attribute] is the same
	* as the actual value of its own name attribute plus
	* target namespace, then it must have exactly one such group."
	*/
	if (pctxt->redefCounter != 0) {
	    xmlChar *str = NULL;

	    xmlSchemaCustomErr(ACTXT_CAST pctxt,
		XML_SCHEMAP_SRC_REDEFINE, node, NULL,
		"The redefining attribute group definition "
		"'%s' must not contain more than one "
		"reference to the redefined definition",
		xmlSchemaFormatQName(&str, refNs, ref), NULL);
	    FREE_AND_NULL(str);
	    return(NULL);
	}
	pctxt->redefCounter++;
	/*
	* URGENT TODO: How to ensure that the reference will not be
	* handled by the normal component resolution mechanism?
	*/
	ret = xmlSchemaNewQNameRef(pctxt,
	    XML_SCHEMA_TYPE_ATTRIBUTEGROUP, ref, refNs);
	if (ret == NULL)
	    return(NULL);
	ret->node = node;
	pctxt->redef->reference = WXS_BASIC_CAST ret;
    } else {
	/*
	* Create a QName-reference helper component. We will substitute this
	* component for the attribute uses of the referenced attribute group
	* definition.
	*/
	ret = xmlSchemaNewQNameRef(pctxt,
	    XML_SCHEMA_TYPE_ATTRIBUTEGROUP, ref, refNs);
	if (ret == NULL)
	    return(NULL);
	ret->node = node;
	/* Add to pending items, to be able to resolve the reference. */
	WXS_ADD_PENDING(pctxt, ret);
    }
    return (ret);
}

/**
 * xmlSchemaParseAttributeGroupDefinition:
 * @pctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Attribute Group declaration
 * *WARNING* this interface is highly subject to change
 *
 * Returns the attribute group definition or NULL in case of error.
 */
static xmlSchemaAttributeGroupPtr
xmlSchemaParseAttributeGroupDefinition(xmlSchemaParserCtxtPtr pctxt,
				       xmlSchemaPtr schema,
				       xmlNodePtr node)
{
    const xmlChar *name;
    xmlSchemaAttributeGroupPtr ret;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    int hasRefs = 0;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(pctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node, "name", NULL);
	return (NULL);
    }
    /*
    * The name is crucial, exit if invalid.
    */
    if (xmlSchemaPValAttrNode(pctxt,
	NULL, attr,
	xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
	return (NULL);
    }
    ret = xmlSchemaAddAttributeGroupDefinition(pctxt, schema,
	name, pctxt->targetNamespace, node);
    if (ret == NULL)
	return (NULL);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "id")))
	    {
		xmlSchemaPIllegalAttrErr(pctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(pctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    /* Attribute ID */
    xmlSchemaPValAttrID(pctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        ret->annot = xmlSchemaParseAnnotation(pctxt, child, 1);
        child = child->next;
    }
    /*
    * Parse contained attribute decls/refs.
    */
    if (xmlSchemaParseLocalAttributes(pctxt, schema, &child,
	(xmlSchemaItemListPtr *) &(ret->attrUses),
	XML_SCHEMA_TYPE_ATTRIBUTEGROUP, &hasRefs) == -1)
	return(NULL);
    if (hasRefs)
	ret->flags |= XML_SCHEMAS_ATTRGROUP_HAS_REFS;
    /*
    * Parse the attribute wildcard.
    */
    if (IS_SCHEMA(child, "anyAttribute")) {
	ret->attributeWildcard = xmlSchemaParseAnyAttribute(pctxt,
	    schema, child);
	child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(pctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?, ((attribute | attributeGroup)*, anyAttribute?))");
    }
    return (ret);
}

/**
 * xmlSchemaPValAttrFormDefault:
 * @value:  the value
 * @flags: the flags to be modified
 * @flagQualified: the specific flag for "qualified"
 *
 * Returns 0 if the value is valid, 1 otherwise.
 */
static int
xmlSchemaPValAttrFormDefault(const xmlChar *value,
			     int *flags,
			     int flagQualified)
{
    if (xmlStrEqual(value, BAD_CAST "qualified")) {
	if  ((*flags & flagQualified) == 0)
	    *flags |= flagQualified;
    } else if (!xmlStrEqual(value, BAD_CAST "unqualified"))
	return (1);

    return (0);
}

/**
 * xmlSchemaPValAttrBlockFinal:
 * @value:  the value
 * @flags: the flags to be modified
 * @flagAll: the specific flag for "#all"
 * @flagExtension: the specific flag for "extension"
 * @flagRestriction: the specific flag for "restriction"
 * @flagSubstitution: the specific flag for "substitution"
 * @flagList: the specific flag for "list"
 * @flagUnion: the specific flag for "union"
 *
 * Validates the value of the attribute "final" and "block". The value
 * is converted into the specified flag values and returned in @flags.
 *
 * Returns 0 if the value is valid, 1 otherwise.
 */

static int
xmlSchemaPValAttrBlockFinal(const xmlChar *value,
			    int *flags,
			    int flagAll,
			    int flagExtension,
			    int flagRestriction,
			    int flagSubstitution,
			    int flagList,
			    int flagUnion)
{
    int ret = 0;

    /*
    * TODO: This does not check for dublicate entries.
    */
    if ((flags == NULL) || (value == NULL))
	return (-1);
    if (value[0] == 0)
	return (0);
    if (xmlStrEqual(value, BAD_CAST "#all")) {
	if (flagAll != -1)
	    *flags |= flagAll;
	else {
	    if (flagExtension != -1)
		*flags |= flagExtension;
	    if (flagRestriction != -1)
		*flags |= flagRestriction;
	    if (flagSubstitution != -1)
		*flags |= flagSubstitution;
	    if (flagList != -1)
		*flags |= flagList;
	    if (flagUnion != -1)
		*flags |= flagUnion;
	}
    } else {
	const xmlChar *end, *cur = value;
	xmlChar *item;

	do {
	    while (IS_BLANK_CH(*cur))
		cur++;
	    end = cur;
	    while ((*end != 0) && (!(IS_BLANK_CH(*end))))
		end++;
	    if (end == cur)
		break;
	    item = xmlStrndup(cur, end - cur);
	    if (xmlStrEqual(item, BAD_CAST "extension")) {
		if (flagExtension != -1) {
		    if ((*flags & flagExtension) == 0)
			*flags |= flagExtension;
		} else
		    ret = 1;
	    } else if (xmlStrEqual(item, BAD_CAST "restriction")) {
		if (flagRestriction != -1) {
		    if ((*flags & flagRestriction) == 0)
			*flags |= flagRestriction;
		} else
		    ret = 1;
	    } else if (xmlStrEqual(item, BAD_CAST "substitution")) {
		if (flagSubstitution != -1) {
		    if ((*flags & flagSubstitution) == 0)
			*flags |= flagSubstitution;
		} else
		    ret = 1;
	    } else if (xmlStrEqual(item, BAD_CAST "list")) {
		if (flagList != -1) {
		    if ((*flags & flagList) == 0)
			*flags |= flagList;
		} else
		    ret = 1;
	    } else if (xmlStrEqual(item, BAD_CAST "union")) {
		if (flagUnion != -1) {
		    if ((*flags & flagUnion) == 0)
			*flags |= flagUnion;
		} else
		    ret = 1;
	    } else
		ret = 1;
	    if (item != NULL)
		xmlFree(item);
	    cur = end;
	} while ((ret == 0) && (*cur != 0));
    }

    return (ret);
}

static int
xmlSchemaCheckCSelectorXPath(xmlSchemaParserCtxtPtr ctxt,
			     xmlSchemaIDCPtr idc,
			     xmlSchemaIDCSelectPtr selector,
			     xmlAttrPtr attr,
			     int isField)
{
    xmlNodePtr node;

    /*
    * c-selector-xpath:
    * Schema Component Constraint: Selector Value OK
    *
    * TODO: 1 The {selector} must be a valid XPath expression, as defined
    * in [XPath].
    */
    if (selector == NULL) {
	xmlSchemaPErr(ctxt, idc->node,
	    XML_SCHEMAP_INTERNAL,
	    "Internal error: xmlSchemaCheckCSelectorXPath, "
	    "the selector is not specified.\n", NULL, NULL);
	return (-1);
    }
    if (attr == NULL)
	node = idc->node;
    else
	node = (xmlNodePtr) attr;
    if (selector->xpath == NULL) {
	xmlSchemaPCustomErr(ctxt,
	    /* TODO: Adjust error code. */
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    NULL, node,
	    "The XPath expression of the selector is not valid", NULL);
	return (XML_SCHEMAP_S4S_ATTR_INVALID_VALUE);
    } else {
	const xmlChar **nsArray = NULL;
	xmlNsPtr *nsList = NULL;
	/*
	* Compile the XPath expression.
	*/
	/*
	* TODO: We need the array of in-scope namespaces for compilation.
	* TODO: Call xmlPatterncompile with different options for selector/
	* field.
	*/
	if (attr == NULL)
	    nsList = NULL;
	else
	    nsList = xmlGetNsList(attr->doc, attr->parent);
	/*
	* Build an array of prefixes and namespaces.
	*/
	if (nsList != NULL) {
	    int i, count = 0;

	    for (i = 0; nsList[i] != NULL; i++)
		count++;

	    nsArray = (const xmlChar **) xmlMalloc(
		(count * 2 + 1) * sizeof(const xmlChar *));
	    if (nsArray == NULL) {
		xmlSchemaPErrMemory(ctxt, "allocating a namespace array",
		    NULL);
		xmlFree(nsList);
		return (-1);
	    }
	    for (i = 0; i < count; i++) {
		nsArray[2 * i] = nsList[i]->href;
		nsArray[2 * i + 1] = nsList[i]->prefix;
	    }
	    nsArray[count * 2] = NULL;
	    xmlFree(nsList);
	}
	/*
	* TODO: Differentiate between "selector" and "field".
	*/
	if (isField)
	    selector->xpathComp = (void *) xmlPatterncompile(selector->xpath,
		NULL, XML_PATTERN_XSFIELD, nsArray);
	else
	    selector->xpathComp = (void *) xmlPatterncompile(selector->xpath,
		NULL, XML_PATTERN_XSSEL, nsArray);
	if (nsArray != NULL)
	    xmlFree((xmlChar **) nsArray);

	if (selector->xpathComp == NULL) {
	    xmlSchemaPCustomErr(ctxt,
		/* TODO: Adjust error code? */
		XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		NULL, node,
		"The XPath expression '%s' could not be "
		"compiled", selector->xpath);
	    return (XML_SCHEMAP_S4S_ATTR_INVALID_VALUE);
	}
    }
    return (0);
}

#define ADD_ANNOTATION(annot)   \
    xmlSchemaAnnotPtr cur = item->annot; \
    if (item->annot == NULL) {  \
	item->annot = annot;    \
	return (annot);         \
    }                           \
    cur = item->annot;          \
    if (cur->next != NULL) {    \
	cur = cur->next;	\
    }                           \
    cur->next = annot;

/**
 * xmlSchemaAssignAnnotation:
 * @item: the schema component
 * @annot: the annotation
 *
 * Adds the annotation to the given schema component.
 *
 * Returns the given annotaion.
 */
static xmlSchemaAnnotPtr
xmlSchemaAddAnnotation(xmlSchemaAnnotItemPtr annItem,
		       xmlSchemaAnnotPtr annot)
{
    if ((annItem == NULL) || (annot == NULL))
	return (NULL);
    switch (annItem->type) {
	case XML_SCHEMA_TYPE_ELEMENT: {
		xmlSchemaElementPtr item = (xmlSchemaElementPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTE: {
		xmlSchemaAttributePtr item = (xmlSchemaAttributePtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_ANY_ATTRIBUTE:
	case XML_SCHEMA_TYPE_ANY: {
		xmlSchemaWildcardPtr item = (xmlSchemaWildcardPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_PARTICLE:
	case XML_SCHEMA_TYPE_IDC_KEY:
	case XML_SCHEMA_TYPE_IDC_KEYREF:
	case XML_SCHEMA_TYPE_IDC_UNIQUE: {
		xmlSchemaAnnotItemPtr item = (xmlSchemaAnnotItemPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_ATTRIBUTEGROUP: {
		xmlSchemaAttributeGroupPtr item =
		    (xmlSchemaAttributeGroupPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_NOTATION: {
		xmlSchemaNotationPtr item = (xmlSchemaNotationPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_FACET_MININCLUSIVE:
	case XML_SCHEMA_FACET_MINEXCLUSIVE:
	case XML_SCHEMA_FACET_MAXINCLUSIVE:
	case XML_SCHEMA_FACET_MAXEXCLUSIVE:
	case XML_SCHEMA_FACET_TOTALDIGITS:
	case XML_SCHEMA_FACET_FRACTIONDIGITS:
	case XML_SCHEMA_FACET_PATTERN:
	case XML_SCHEMA_FACET_ENUMERATION:
	case XML_SCHEMA_FACET_WHITESPACE:
	case XML_SCHEMA_FACET_LENGTH:
	case XML_SCHEMA_FACET_MAXLENGTH:
	case XML_SCHEMA_FACET_MINLENGTH: {
		xmlSchemaFacetPtr item = (xmlSchemaFacetPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_SIMPLE:
	case XML_SCHEMA_TYPE_COMPLEX: {
		xmlSchemaTypePtr item = (xmlSchemaTypePtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_GROUP: {
		xmlSchemaModelGroupDefPtr item = (xmlSchemaModelGroupDefPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	case XML_SCHEMA_TYPE_SEQUENCE:
	case XML_SCHEMA_TYPE_CHOICE:
	case XML_SCHEMA_TYPE_ALL: {
		xmlSchemaModelGroupPtr item = (xmlSchemaModelGroupPtr) annItem;
		ADD_ANNOTATION(annot)
	    }
	    break;
	default:
	     xmlSchemaPCustomErr(NULL,
		XML_SCHEMAP_INTERNAL,
		NULL, NULL,
		"Internal error: xmlSchemaAddAnnotation, "
		"The item is not a annotated schema component", NULL);
	     break;
    }
    return (annot);
}

/**
 * xmlSchemaParseIDCSelectorAndField:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML Schema identity-contraint definition's
 * <selector> and <field> elements.
 *
 * Returns the parsed identity-constraint definition.
 */
static xmlSchemaIDCSelectPtr
xmlSchemaParseIDCSelectorAndField(xmlSchemaParserCtxtPtr ctxt,
			  xmlSchemaIDCPtr idc,
			  xmlNodePtr node,
			  int isField)
{
    xmlSchemaIDCSelectPtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "xpath"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    /*
    * Create the item.
    */
    item = (xmlSchemaIDCSelectPtr) xmlMalloc(sizeof(xmlSchemaIDCSelect));
    if (item == NULL) {
        xmlSchemaPErrMemory(ctxt,
	    "allocating a 'selector' of an identity-constraint definition",
	    NULL);
        return (NULL);
    }
    memset(item, 0, sizeof(xmlSchemaIDCSelect));
    /*
    * Attribute "xpath" (mandatory).
    */
    attr = xmlSchemaGetPropNode(node, "xpath");
    if (attr == NULL) {
    	xmlSchemaPMissingAttrErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node,
	    "name", NULL);
    } else {
	item->xpath = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	/*
	* URGENT TODO: "field"s have an other syntax than "selector"s.
	*/

	if (xmlSchemaCheckCSelectorXPath(ctxt, idc, item, attr,
	    isField) == -1) {
	    xmlSchemaPErr(ctxt,
		(xmlNodePtr) attr,
		XML_SCHEMAP_INTERNAL,
		"Internal error: xmlSchemaParseIDCSelectorAndField, "
		"validating the XPath expression of a IDC selector.\n",
		NULL, NULL);
	}

    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	/*
	* Add the annotation to the parent IDC.
	*/
	xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) idc,
	    xmlSchemaParseAnnotation(ctxt, child, 1));
	child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child,
	    NULL, "(annotation?)");
    }

    return (item);
}

/**
 * xmlSchemaParseIDC:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML Schema identity-contraint definition.
 *
 * Returns the parsed identity-constraint definition.
 */
static xmlSchemaIDCPtr
xmlSchemaParseIDC(xmlSchemaParserCtxtPtr ctxt,
		  xmlSchemaPtr schema,
		  xmlNodePtr node,
		  xmlSchemaTypeType idcCategory,
		  const xmlChar *targetNamespace)
{
    xmlSchemaIDCPtr item = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *name = NULL;
    xmlSchemaIDCSelectPtr field = NULL, lastField = NULL;

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		((idcCategory != XML_SCHEMA_TYPE_IDC_KEYREF) ||
		 (!xmlStrEqual(attr->name, BAD_CAST "refer")))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    /*
    * Attribute "name" (mandatory).
    */
    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node,
	    "name", NULL);
	return (NULL);
    } else if (xmlSchemaPValAttrNode(ctxt,
	NULL, attr,
	xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
	return (NULL);
    }
    /* Create the component. */
    item = xmlSchemaAddIDC(ctxt, schema, name, targetNamespace,
	idcCategory, node);
    if (item == NULL)
	return(NULL);

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    if (idcCategory == XML_SCHEMA_TYPE_IDC_KEYREF) {
	/*
	* Attribute "refer" (mandatory).
	*/
	attr = xmlSchemaGetPropNode(node, "refer");
	if (attr == NULL) {
	    xmlSchemaPMissingAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_MISSING,
		NULL, node,
		"refer", NULL);
	} else {
	    /*
	    * Create a reference item.
	    */
	    item->ref = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_IDC_KEY,
		NULL, NULL);
	    if (item->ref == NULL)
		return (NULL);
	    xmlSchemaPValAttrNodeQName(ctxt, schema,
		NULL, attr,
		&(item->ref->targetNamespace),
		&(item->ref->name));
	    xmlSchemaCheckReference(ctxt, schema, node, attr,
		item->ref->targetNamespace);
	}
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	child = child->next;
    }
    if (child == NULL) {
	xmlSchemaPContentErr(ctxt,
		XML_SCHEMAP_S4S_ELEM_MISSING,
		NULL, node, child,
		"A child element is missing",
		"(annotation?, (selector, field+))");
    }
    /*
    * Child element <selector>.
    */
    if (IS_SCHEMA(child, "selector")) {
	item->selector = xmlSchemaParseIDCSelectorAndField(ctxt,
	    item, child, 0);
	child = child->next;
	/*
	* Child elements <field>.
	*/
	if (IS_SCHEMA(child, "field")) {
	    do {
		field = xmlSchemaParseIDCSelectorAndField(ctxt,
		    item, child, 1);
		if (field != NULL) {
		    field->index = item->nbFields;
		    item->nbFields++;
		    if (lastField != NULL)
			lastField->next = field;
		    else
			item->fields = field;
		    lastField = field;
		}
		child = child->next;
	    } while (IS_SCHEMA(child, "field"));
	} else {
	    xmlSchemaPContentErr(ctxt,
		XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, node, child,
		NULL, "(annotation?, (selector, field+))");
	}
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child,
	    NULL, "(annotation?, (selector, field+))");
    }

    return (item);
}

/**
 * xmlSchemaParseElement:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 * @topLevel: indicates if this is global declaration
 *
 * Parses a XML schema element declaration.
 * *WARNING* this interface is highly subject to change
 *
 * Returns the element declaration or a particle; NULL in case
 * of an error or if the particle has minOccurs==maxOccurs==0.
 */
static xmlSchemaBasicItemPtr
xmlSchemaParseElement(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                      xmlNodePtr node, int *isElemRef, int topLevel)
{
    xmlSchemaElementPtr decl = NULL;
    xmlSchemaParticlePtr particle = NULL;
    xmlSchemaAnnotPtr annot = NULL;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr, nameAttr;
    int min, max, isRef = 0;
    xmlChar *des = NULL;

    /* 3.3.3 Constraints on XML Representations of Element Declarations */
    /* TODO: Complete implementation of 3.3.6 */

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    if (isElemRef != NULL)
	*isElemRef = 0;
    /*
    * If we get a "ref" attribute on a local <element> we will assume it's
    * a reference - even if there's a "name" attribute; this seems to be more
    * robust.
    */
    nameAttr = xmlSchemaGetPropNode(node, "name");
    attr = xmlSchemaGetPropNode(node, "ref");
    if ((topLevel) || (attr == NULL)) {
	if (nameAttr == NULL) {
	    xmlSchemaPMissingAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_MISSING,
		NULL, node, "name", NULL);
	    return (NULL);
	}
    } else
	isRef = 1;

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	child = child->next;
    }
    /*
    * Skip particle part if a global declaration.
    */
    if (topLevel)
	goto declaration_part;
    /*
    * The particle part ==================================================
    */
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1, "xs:nonNegativeInteger");
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1, "(xs:nonNegativeInteger | unbounded)");
    xmlSchemaPCheckParticleCorrect_2(ctxt, NULL, node, min, max);
    particle = xmlSchemaAddParticle(ctxt, node, min, max);
    if (particle == NULL)
	goto return_null;

    /* ret->flags |= XML_SCHEMAS_ELEM_REF; */

    if (isRef) {
	const xmlChar *refNs = NULL, *ref = NULL;
	xmlSchemaQNameRefPtr refer = NULL;
	/*
	* The reference part =============================================
	*/
	if (isElemRef != NULL)
	    *isElemRef = 1;

	xmlSchemaPValAttrNodeQName(ctxt, schema,
	    NULL, attr, &refNs, &ref);
	xmlSchemaCheckReference(ctxt, schema, node, attr, refNs);
	/*
	* SPEC (3.3.3 : 2.1) "One of ref or name must be present, but not both"
	*/
	if (nameAttr != NULL) {
	    xmlSchemaPMutualExclAttrErr(ctxt,
		XML_SCHEMAP_SRC_ELEMENT_2_1, NULL, nameAttr, "ref", "name");
	}
	/*
	* Check for illegal attributes.
	*/
	attr = node->properties;
	while (attr != NULL) {
	    if (attr->ns == NULL) {
		if (xmlStrEqual(attr->name, BAD_CAST "ref") ||
		    xmlStrEqual(attr->name, BAD_CAST "name") ||
		    xmlStrEqual(attr->name, BAD_CAST "id") ||
		    xmlStrEqual(attr->name, BAD_CAST "maxOccurs") ||
		    xmlStrEqual(attr->name, BAD_CAST "minOccurs"))
		{
		    attr = attr->next;
		    continue;
		} else {
		    /* SPEC (3.3.3 : 2.2) */
		    xmlSchemaPCustomAttrErr(ctxt,
			XML_SCHEMAP_SRC_ELEMENT_2_2,
			NULL, NULL, attr,
			"Only the attributes 'minOccurs', 'maxOccurs' and "
			"'id' are allowed in addition to 'ref'");
		    break;
		}
	    } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	    attr = attr->next;
	}
	/*
	* No children except <annotation> expected.
	*/
	if (child != NULL) {
	    xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, node, child, NULL, "(annotation?)");
	}
	if ((min == 0) && (max == 0))
	    goto return_null;
	/*
	* Create the reference item and attach it to the particle.
	*/
	refer = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_ELEMENT,
	    ref, refNs);
	if (refer == NULL)
	    goto return_null;
	particle->children = (xmlSchemaTreeItemPtr) refer;
	particle->annot = annot;
	/*
	* Add the particle to pending components, since the reference
	* need to be resolved.
	*/
	WXS_ADD_PENDING(ctxt, particle);
	return ((xmlSchemaBasicItemPtr) particle);
    }
    /*
    * The declaration part ===============================================
    */
declaration_part:
    {
	const xmlChar *ns = NULL, *fixed, *name, *attrValue;
	xmlSchemaIDCPtr curIDC = NULL, lastIDC = NULL;

	if (xmlSchemaPValAttrNode(ctxt, NULL, nameAttr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0)
	    goto return_null;
	/*
	* Evaluate the target namespace.
	*/
	if (topLevel) {
	    ns = ctxt->targetNamespace;
	} else {
	    attr = xmlSchemaGetPropNode(node, "form");
	    if (attr != NULL) {
		attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
		if (xmlStrEqual(attrValue, BAD_CAST "qualified")) {
		    ns = ctxt->targetNamespace;
		} else if (!xmlStrEqual(attrValue, BAD_CAST "unqualified")) {
		    xmlSchemaPSimpleTypeErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
			NULL, (xmlNodePtr) attr,
			NULL, "(qualified | unqualified)",
			attrValue, NULL, NULL, NULL);
		}
	    } else if (schema->flags & XML_SCHEMAS_QUALIF_ELEM)
		ns = ctxt->targetNamespace;
	}
	decl = xmlSchemaAddElement(ctxt, name, ns, node, topLevel);
	if (decl == NULL) {
	    goto return_null;
	}
	/*
	* Check for illegal attributes.
	*/
	attr = node->properties;
	while (attr != NULL) {
	    if (attr->ns == NULL) {
		if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "type")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "default")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "fixed")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "block")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "nillable")))
		{
		    if (topLevel == 0) {
			if ((!xmlStrEqual(attr->name, BAD_CAST "maxOccurs")) &&
			    (!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
			    (!xmlStrEqual(attr->name, BAD_CAST "form")))
			{
			    xmlSchemaPIllegalAttrErr(ctxt,
				XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
			}
		    } else if ((!xmlStrEqual(attr->name, BAD_CAST "final")) &&
			(!xmlStrEqual(attr->name, BAD_CAST "abstract")) &&
			(!xmlStrEqual(attr->name, BAD_CAST "substitutionGroup"))) {

			xmlSchemaPIllegalAttrErr(ctxt,
			    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		    }
		}
	    } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {

		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	    attr = attr->next;
	}
	/*
	* Extract/validate attributes.
	*/
	if (topLevel) {
	    /*
	    * Process top attributes of global element declarations here.
	    */
	    decl->flags |= XML_SCHEMAS_ELEM_GLOBAL;
	    decl->flags |= XML_SCHEMAS_ELEM_TOPLEVEL;
	    xmlSchemaPValAttrQName(ctxt, schema,
		NULL, node, "substitutionGroup",
		&(decl->substGroupNs), &(decl->substGroup));
	    if (xmlGetBooleanProp(ctxt, node, "abstract", 0))
		decl->flags |= XML_SCHEMAS_ELEM_ABSTRACT;
	    /*
	    * Attribute "final".
	    */
	    attr = xmlSchemaGetPropNode(node, "final");
	    if (attr == NULL) {
		if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_EXTENSION)
		    decl->flags |= XML_SCHEMAS_ELEM_FINAL_EXTENSION;
		if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
		    decl->flags |= XML_SCHEMAS_ELEM_FINAL_RESTRICTION;
	    } else {
		attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
		if (xmlSchemaPValAttrBlockFinal(attrValue, &(decl->flags),
		    -1,
		    XML_SCHEMAS_ELEM_FINAL_EXTENSION,
		    XML_SCHEMAS_ELEM_FINAL_RESTRICTION, -1, -1, -1) != 0) {
		    xmlSchemaPSimpleTypeErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
			NULL, (xmlNodePtr) attr,
			NULL, "(#all | List of (extension | restriction))",
			attrValue, NULL, NULL, NULL);
		}
	    }
	}
	/*
	* Attribute "block".
	*/
	attr = xmlSchemaGetPropNode(node, "block");
	if (attr == NULL) {
	    /*
	    * Apply default "block" values.
	    */
	    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION)
		decl->flags |= XML_SCHEMAS_ELEM_BLOCK_RESTRICTION;
	    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION)
		decl->flags |= XML_SCHEMAS_ELEM_BLOCK_EXTENSION;
	    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION)
		decl->flags |= XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION;
	} else {
	    attrValue = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	    if (xmlSchemaPValAttrBlockFinal(attrValue, &(decl->flags),
		-1,
		XML_SCHEMAS_ELEM_BLOCK_EXTENSION,
		XML_SCHEMAS_ELEM_BLOCK_RESTRICTION,
		XML_SCHEMAS_ELEM_BLOCK_SUBSTITUTION, -1, -1) != 0) {
		xmlSchemaPSimpleTypeErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		    NULL, (xmlNodePtr) attr,
		    NULL, "(#all | List of (extension | "
		    "restriction | substitution))", attrValue,
		    NULL, NULL, NULL);
	    }
	}
	if (xmlGetBooleanProp(ctxt, node, "nillable", 0))
	    decl->flags |= XML_SCHEMAS_ELEM_NILLABLE;

	attr = xmlSchemaGetPropNode(node, "type");
	if (attr != NULL) {
	    xmlSchemaPValAttrNodeQName(ctxt, schema,
		NULL, attr,
		&(decl->namedTypeNs), &(decl->namedType));
	    xmlSchemaCheckReference(ctxt, schema, node,
		attr, decl->namedTypeNs);
	}
	decl->value = xmlSchemaGetProp(ctxt, node, "default");
	attr = xmlSchemaGetPropNode(node, "fixed");
	if (attr != NULL) {
	    fixed = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	    if (decl->value != NULL) {
		/*
		* 3.3.3 : 1
		* default and fixed must not both be present.
		*/
		xmlSchemaPMutualExclAttrErr(ctxt,
		    XML_SCHEMAP_SRC_ELEMENT_1,
		    NULL, attr, "default", "fixed");
	    } else {
		decl->flags |= XML_SCHEMAS_ELEM_FIXED;
		decl->value = fixed;
	    }
	}
	/*
	* And now for the children...
	*/
	if (IS_SCHEMA(child, "complexType")) {
	    /*
	    * 3.3.3 : 3
	    * "type" and either <simpleType> or <complexType> are mutually
	    * exclusive
	    */
	    if (decl->namedType != NULL) {
		xmlSchemaPContentErr(ctxt,
		    XML_SCHEMAP_SRC_ELEMENT_3,
		    NULL, node, child,
		    "The attribute 'type' and the <complexType> child are "
		    "mutually exclusive", NULL);
	    } else
		WXS_ELEM_TYPEDEF(decl) = xmlSchemaParseComplexType(ctxt, schema, child, 0);
	    child = child->next;
	} else if (IS_SCHEMA(child, "simpleType")) {
	    /*
	    * 3.3.3 : 3
	    * "type" and either <simpleType> or <complexType> are
	    * mutually exclusive
	    */
	    if (decl->namedType != NULL) {
		xmlSchemaPContentErr(ctxt,
		    XML_SCHEMAP_SRC_ELEMENT_3,
		    NULL, node, child,
		    "The attribute 'type' and the <simpleType> child are "
		    "mutually exclusive", NULL);
	    } else
		WXS_ELEM_TYPEDEF(decl) = xmlSchemaParseSimpleType(ctxt, schema, child, 0);
	    child = child->next;
	}
	while ((IS_SCHEMA(child, "unique")) ||
	    (IS_SCHEMA(child, "key")) || (IS_SCHEMA(child, "keyref"))) {
	    if (IS_SCHEMA(child, "unique")) {
		curIDC = xmlSchemaParseIDC(ctxt, schema, child,
		    XML_SCHEMA_TYPE_IDC_UNIQUE, decl->targetNamespace);
	    } else if (IS_SCHEMA(child, "key")) {
		curIDC = xmlSchemaParseIDC(ctxt, schema, child,
		    XML_SCHEMA_TYPE_IDC_KEY, decl->targetNamespace);
	    } else if (IS_SCHEMA(child, "keyref")) {
		curIDC = xmlSchemaParseIDC(ctxt, schema, child,
		    XML_SCHEMA_TYPE_IDC_KEYREF, decl->targetNamespace);
	    }
	    if (lastIDC != NULL)
		lastIDC->next = curIDC;
	    else
		decl->idcs = (void *) curIDC;
	    lastIDC = curIDC;
	    child = child->next;
	}
	if (child != NULL) {
	    xmlSchemaPContentErr(ctxt,
		XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, node, child,
		NULL, "(annotation?, ((simpleType | complexType)?, "
		"(unique | key | keyref)*))");
	}
	decl->annot = annot;
    }
    /*
    * NOTE: Element Declaration Representation OK 4. will be checked at a
    * different layer.
    */
    FREE_AND_NULL(des)
    if (topLevel)
	return ((xmlSchemaBasicItemPtr) decl);
    else {
	particle->children = (xmlSchemaTreeItemPtr) decl;
	return ((xmlSchemaBasicItemPtr) particle);
    }

return_null:
    FREE_AND_NULL(des);
    if (annot != NULL) {
	if (particle != NULL)
	    particle->annot = NULL;
	if (decl != NULL)
	    decl->annot = NULL;
	xmlSchemaFreeAnnot(annot);
    }
    return (NULL);
}

/**
 * xmlSchemaParseUnion:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Union definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of internal error, 0 in case of success and a positive
 * error code otherwise.
 */
static int
xmlSchemaParseUnion(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                    xmlNodePtr node)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *cur = NULL;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (-1);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    /*
    * Mark the simple type as being of variety "union".
    */
    type->flags |= XML_SCHEMAS_TYPE_VARIETY_UNION;
    /*
    * SPEC (Base type) (2) "If the <list> or <union> alternative is chosen,
    * then the simple ur-type definition."
    */
    type->baseType = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYSIMPLETYPE);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "memberTypes"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * Attribute "memberTypes". This is a list of QNames.
    * TODO: Check the value to contain anything.
    */
    attr = xmlSchemaGetPropNode(node, "memberTypes");
    if (attr != NULL) {
	const xmlChar *end;
	xmlChar *tmp;
	const xmlChar *localName, *nsName;
	xmlSchemaTypeLinkPtr link, lastLink = NULL;
	xmlSchemaQNameRefPtr ref;

	cur = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	type->base = cur;
	do {
	    while (IS_BLANK_CH(*cur))
		cur++;
	    end = cur;
	    while ((*end != 0) && (!(IS_BLANK_CH(*end))))
		end++;
	    if (end == cur)
		break;
	    tmp = xmlStrndup(cur, end - cur);
	    if (xmlSchemaPValAttrNodeQNameValue(ctxt, schema,
		NULL, attr, BAD_CAST tmp, &nsName, &localName) == 0) {
		/*
		* Create the member type link.
		*/
		link = (xmlSchemaTypeLinkPtr)
		    xmlMalloc(sizeof(xmlSchemaTypeLink));
		if (link == NULL) {
		    xmlSchemaPErrMemory(ctxt, "xmlSchemaParseUnion, "
			"allocating a type link", NULL);
		    return (-1);
		}
		link->type = NULL;
		link->next = NULL;
		if (lastLink == NULL)
		    type->memberTypes = link;
		else
		    lastLink->next = link;
		lastLink = link;
		/*
		* Create a reference item.
		*/
		ref = xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_SIMPLE,
		    localName, nsName);
		if (ref == NULL) {
		    FREE_AND_NULL(tmp)
		    return (-1);
		}
		/*
		* Assign the reference to the link, it will be resolved
		* later during fixup of the union simple type.
		*/
		link->type = (xmlSchemaTypePtr) ref;
	    }
	    FREE_AND_NULL(tmp)
	    cur = end;
	} while (*cur != 0);

    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	/*
	* Add the annotation to the simple type ancestor.
	*/
	xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
	    xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
	xmlSchemaTypePtr subtype, last = NULL;

	/*
	* Anchor the member types in the "subtypes" field of the
	* simple type.
	*/
	while (IS_SCHEMA(child, "simpleType")) {
	    subtype = (xmlSchemaTypePtr)
		xmlSchemaParseSimpleType(ctxt, schema, child, 0);
	    if (subtype != NULL) {
		if (last == NULL) {
		    type->subtypes = subtype;
		    last = subtype;
		} else {
		    last->next = subtype;
		    last = subtype;
		}
		last->next = NULL;
	    }
	    child = child->next;
	}
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL, "(annotation?, simpleType*)");
    }
    if ((attr == NULL) && (type->subtypes == NULL)) {
	 /*
	* src-union-memberTypes-or-simpleTypes
	* Either the memberTypes [attribute] of the <union> element must
	* be non-empty or there must be at least one simpleType [child].
	*/
	xmlSchemaPCustomErr(ctxt,
	    XML_SCHEMAP_SRC_UNION_MEMBERTYPES_OR_SIMPLETYPES,
	    NULL, node,
	    "Either the attribute 'memberTypes' or "
	    "at least one <simpleType> child must be present", NULL);
    }
    return (0);
}

/**
 * xmlSchemaParseList:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema List definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaTypePtr
xmlSchemaParseList(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                   xmlNodePtr node)
{
    xmlSchemaTypePtr type;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);
    /* Not a component, don't create it. */
    type = ctxt->ctxtType;
    /*
    * Mark the type as being of variety "list".
    */
    type->flags |= XML_SCHEMAS_TYPE_VARIETY_LIST;
    /*
    * SPEC (Base type) (2) "If the <list> or <union> alternative is chosen,
    * then the simple ur-type definition."
    */
    type->baseType = xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYSIMPLETYPE);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "itemType"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }

    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");

    /*
    * Attribute "itemType". NOTE that we will use the "ref" and "refNs"
    * fields for holding the reference to the itemType.
    *
    * REVAMP TODO: Use the "base" and "baseNs" fields, since we will remove
    * the "ref" fields.
    */
    xmlSchemaPValAttrQName(ctxt, schema, NULL,
	node, "itemType", &(type->baseNs), &(type->base));
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	xmlSchemaAddAnnotation((xmlSchemaAnnotItemPtr) type,
	    xmlSchemaParseAnnotation(ctxt, child, 1));
        child = child->next;
    }
    if (IS_SCHEMA(child, "simpleType")) {
	/*
	* src-list-itemType-or-simpleType
	* Either the itemType [attribute] or the <simpleType> [child] of
	* the <list> element must be present, but not both.
	*/
	if (type->base != NULL) {
	    xmlSchemaPCustomErr(ctxt,
		XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
		NULL, node,
		"The attribute 'itemType' and the <simpleType> child "
		"are mutually exclusive", NULL);
	} else {
	    type->subtypes = xmlSchemaParseSimpleType(ctxt, schema, child, 0);
	}
        child = child->next;
    } else if (type->base == NULL) {
	xmlSchemaPCustomErr(ctxt,
	    XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
	    NULL, node,
	    "Either the attribute 'itemType' or the <simpleType> child "
	    "must be present", NULL);
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL, "(annotation?, simpleType?)");
    }
    if ((type->base == NULL) &&
	(type->subtypes == NULL) &&
	(xmlSchemaGetPropNode(node, "itemType") == NULL)) {
	xmlSchemaPCustomErr(ctxt,
	    XML_SCHEMAP_SRC_SIMPLE_TYPE_1,
	    NULL, node,
	    "Either the attribute 'itemType' or the <simpleType> child "
	    "must be present", NULL);
    }
    return (NULL);
}

/**
 * xmlSchemaParseSimpleType:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Simple Type definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 * 1 in case of success.
 */
static xmlSchemaTypePtr
xmlSchemaParseSimpleType(xmlSchemaParserCtxtPtr ctxt, xmlSchemaPtr schema,
                         xmlNodePtr node, int topLevel)
{
    xmlSchemaTypePtr type, oldCtxtType;
    xmlNodePtr child = NULL;
    const xmlChar *attrValue = NULL;
    xmlAttrPtr attr;
    int hasRestriction = 0;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    if (topLevel) {
	attr = xmlSchemaGetPropNode(node, "name");
	if (attr == NULL) {
	    xmlSchemaPMissingAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_MISSING,
		NULL, node,
		"name", NULL);
	    return (NULL);
	} else {
	    if (xmlSchemaPValAttrNode(ctxt,
		NULL, attr,
		xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &attrValue) != 0)
		return (NULL);
	    /*
	    * Skip built-in types.
	    */
	    if (ctxt->isS4S) {
		xmlSchemaTypePtr biType;

		if (ctxt->isRedefine) {
		    /*
		    * REDEFINE: Disallow redefinition of built-in-types.
		    * TODO: It seems that the spec does not say anything
		    * about this case.
		    */
		    xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_SRC_REDEFINE,
			NULL, node,
			"Redefinition of built-in simple types is not "
			"supported", NULL);
		    return(NULL);
		}
		biType = xmlSchemaGetPredefinedType(attrValue, xmlSchemaNs);
		if (biType != NULL)
		    return (biType);
	    }
	}
    }
    /*
    * TargetNamespace:
    * SPEC "The actual value of the targetNamespace [attribute]
    * of the <schema> ancestor element information item if present,
    * otherwise absent.
    */
    if (topLevel == 0) {
#ifdef ENABLE_NAMED_LOCALS
        char buf[40];
#endif
	/*
	* Parse as local simple type definition.
	*/
#ifdef ENABLE_NAMED_LOCALS
        snprintf(buf, 39, "#ST%d", ctxt->counter++ + 1);
	type = xmlSchemaAddType(ctxt, schema,
	    XML_SCHEMA_TYPE_SIMPLE,
	    xmlDictLookup(ctxt->dict, (const xmlChar *)buf, -1),
	    ctxt->targetNamespace, node, 0);
#else
	type = xmlSchemaAddType(ctxt, schema,
	    XML_SCHEMA_TYPE_SIMPLE,
	    NULL, ctxt->targetNamespace, node, 0);
#endif
	if (type == NULL)
	    return (NULL);
	type->type = XML_SCHEMA_TYPE_SIMPLE;
	type->contentType = XML_SCHEMA_CONTENT_SIMPLE;
	/*
	* Check for illegal attributes.
	*/
	attr = node->properties;
	while (attr != NULL) {
	    if (attr->ns == NULL) {
		if (!xmlStrEqual(attr->name, BAD_CAST "id")) {
		    xmlSchemaPIllegalAttrErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		}
	    } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
		    xmlSchemaPIllegalAttrErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	    attr = attr->next;
	}
    } else {
	/*
	* Parse as global simple type definition.
	*
	* Note that attrValue is the value of the attribute "name" here.
	*/
	type = xmlSchemaAddType(ctxt, schema, XML_SCHEMA_TYPE_SIMPLE,
	    attrValue, ctxt->targetNamespace, node, 1);
	if (type == NULL)
	    return (NULL);
	type->type = XML_SCHEMA_TYPE_SIMPLE;
	type->contentType = XML_SCHEMA_CONTENT_SIMPLE;
	type->flags |= XML_SCHEMAS_TYPE_GLOBAL;
	/*
	* Check for illegal attributes.
	*/
	attr = node->properties;
	while (attr != NULL) {
	    if (attr->ns == NULL) {
		if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		    (!xmlStrEqual(attr->name, BAD_CAST "final"))) {
		    xmlSchemaPIllegalAttrErr(ctxt,
			XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
		}
	    } else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	    attr = attr->next;
	}
	/*
	* Attribute "final".
	*/
	attr = xmlSchemaGetPropNode(node, "final");
	if (attr == NULL) {
	    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
		type->flags |= XML_SCHEMAS_TYPE_FINAL_RESTRICTION;
	    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_LIST)
		type->flags |= XML_SCHEMAS_TYPE_FINAL_LIST;
	    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_UNION)
		type->flags |= XML_SCHEMAS_TYPE_FINAL_UNION;
	} else {
	    attrValue = xmlSchemaGetProp(ctxt, node, "final");
	    if (xmlSchemaPValAttrBlockFinal(attrValue, &(type->flags),
		-1, -1, XML_SCHEMAS_TYPE_FINAL_RESTRICTION, -1,
		XML_SCHEMAS_TYPE_FINAL_LIST,
		XML_SCHEMAS_TYPE_FINAL_UNION) != 0) {

		xmlSchemaPSimpleTypeErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		    WXS_BASIC_CAST type, (xmlNodePtr) attr,
		    NULL, "(#all | List of (list | union | restriction)",
		    attrValue, NULL, NULL, NULL);
	    }
	}
    }
    type->targetNamespace = ctxt->targetNamespace;
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    oldCtxtType = ctxt->ctxtType;

    ctxt->ctxtType = type;

    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        type->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
        child = child->next;
    }
    if (child == NULL) {
	xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_MISSING,
	    NULL, node, child, NULL,
	    "(annotation?, (restriction | list | union))");
    } else if (IS_SCHEMA(child, "restriction")) {
        xmlSchemaParseRestriction(ctxt, schema, child,
	    XML_SCHEMA_TYPE_SIMPLE);
	hasRestriction = 1;
        child = child->next;
    } else if (IS_SCHEMA(child, "list")) {
        xmlSchemaParseList(ctxt, schema, child);
        child = child->next;
    } else if (IS_SCHEMA(child, "union")) {
        xmlSchemaParseUnion(ctxt, schema, child);
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt, XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?, (restriction | list | union))");
    }
    /*
    * REDEFINE: SPEC src-redefine (5)
    * "Within the [children], each <simpleType> must have a
    * <restriction> among its [children] ... the actual value of whose
    * base [attribute] must be the same as the actual value of its own
    * name attribute plus target namespace;"
    */
    if (topLevel && ctxt->isRedefine && (! hasRestriction)) {
	xmlSchemaPCustomErr(ctxt, XML_SCHEMAP_SRC_REDEFINE,
	    NULL, node, "This is a redefinition, thus the "
	    "<simpleType> must have a <restriction> child", NULL);
    }

    ctxt->ctxtType = oldCtxtType;
    return (type);
}

/**
 * xmlSchemaParseModelGroupDefRef:
 * @ctxt:  the parser context
 * @schema: the schema being built
 * @node:  the node
 *
 * Parses a reference to a model group definition.
 *
 * We will return a particle component with a qname-component or
 * NULL in case of an error.
 */
static xmlSchemaTreeItemPtr
xmlSchemaParseModelGroupDefRef(xmlSchemaParserCtxtPtr ctxt,
			       xmlSchemaPtr schema,
			       xmlNodePtr node)
{
    xmlSchemaParticlePtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *ref = NULL, *refNs = NULL;
    int min, max;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "ref");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node, "ref", NULL);
	return (NULL);
    } else if (xmlSchemaPValAttrNodeQName(ctxt, schema, NULL,
	attr, &refNs, &ref) != 0) {
	return (NULL);
    }
    xmlSchemaCheckReference(ctxt, schema, node, attr, refNs);
    min = xmlGetMinOccurs(ctxt, node, 0, -1, 1, "xs:nonNegativeInteger");
    max = xmlGetMaxOccurs(ctxt, node, 0, UNBOUNDED, 1,
	"(xs:nonNegativeInteger | unbounded)");
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "ref")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "minOccurs")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "maxOccurs"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    item = xmlSchemaAddParticle(ctxt, node, min, max);
    if (item == NULL)
	return (NULL);
    /*
    * Create a qname-reference and set as the term; it will be substituted
    * for the model group after the reference has been resolved.
    */
    item->children = (xmlSchemaTreeItemPtr)
	xmlSchemaNewQNameRef(ctxt, XML_SCHEMA_TYPE_GROUP, ref, refNs);
    xmlSchemaPCheckParticleCorrect_2(ctxt, item, node, min, max);
    /*
    * And now for the children...
    */
    child = node->children;
    /* TODO: Is annotation even allowed for a model group reference? */
    if (IS_SCHEMA(child, "annotation")) {
	/*
	* TODO: What to do exactly with the annotation?
	*/
	item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?)");
    }
    /*
    * Corresponds to no component at all if minOccurs==maxOccurs==0.
    */
    if ((min == 0) && (max == 0))
	return (NULL);

    return ((xmlSchemaTreeItemPtr) item);
}

/**
 * xmlSchemaParseModelGroupDefinition:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parses a XML schema model group definition.
 *
 * Note that the contraint src-redefine (6.2) can't be applied until
 * references have been resolved. So we will do this at the
 * component fixup level.
 *
 * *WARNING* this interface is highly subject to change
 *
 * Returns -1 in case of error, 0 if the declaration is improper and
 *         1 in case of success.
 */
static xmlSchemaModelGroupDefPtr
xmlSchemaParseModelGroupDefinition(xmlSchemaParserCtxtPtr ctxt,
				   xmlSchemaPtr schema,
				   xmlNodePtr node)
{
    xmlSchemaModelGroupDefPtr item;
    xmlNodePtr child = NULL;
    xmlAttrPtr attr;
    const xmlChar *name;

    if ((ctxt == NULL) || (schema == NULL) || (node == NULL))
        return (NULL);

    attr = xmlSchemaGetPropNode(node, "name");
    if (attr == NULL) {
	xmlSchemaPMissingAttrErr(ctxt,
	    XML_SCHEMAP_S4S_ATTR_MISSING,
	    NULL, node,
	    "name", NULL);
	return (NULL);
    } else if (xmlSchemaPValAttrNode(ctxt, NULL, attr,
	xmlSchemaGetBuiltInType(XML_SCHEMAS_NCNAME), &name) != 0) {
	return (NULL);
    }
    item = xmlSchemaAddModelGroupDefinition(ctxt, schema, name,
	ctxt->targetNamespace, node);
    if (item == NULL)
	return (NULL);
    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "name")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "id"))) {
		xmlSchemaPIllegalAttrErr(ctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
	item->annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	child = child->next;
    }
    if (IS_SCHEMA(child, "all")) {
	item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
	    XML_SCHEMA_TYPE_ALL, 0);
	child = child->next;
    } else if (IS_SCHEMA(child, "choice")) {
	item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
	    XML_SCHEMA_TYPE_CHOICE, 0);
	child = child->next;
    } else if (IS_SCHEMA(child, "sequence")) {
	item->children = xmlSchemaParseModelGroup(ctxt, schema, child,
	    XML_SCHEMA_TYPE_SEQUENCE, 0);
	child = child->next;
    }



    if (child != NULL) {
	xmlSchemaPContentErr(ctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?, (all | choice | sequence)?)");
    }
    return (item);
}

/**
 * xmlSchemaCleanupDoc:
 * @ctxt:  a schema validation context
 * @node:  the root of the document.
 *
 * removes unwanted nodes in a schemas document tree
 */
static void
xmlSchemaCleanupDoc(xmlSchemaParserCtxtPtr ctxt, xmlNodePtr root)
{
    xmlNodePtr delete, cur;

    if ((ctxt == NULL) || (root == NULL)) return;

    /*
     * Remove all the blank text nodes
     */
    delete = NULL;
    cur = root;
    while (cur != NULL) {
        if (delete != NULL) {
            xmlUnlinkNode(delete);
            xmlFreeNode(delete);
            delete = NULL;
        }
        if (cur->type == XML_TEXT_NODE) {
            if (IS_BLANK_NODE(cur)) {
                if (xmlNodeGetSpacePreserve(cur) != 1) {
                    delete = cur;
                }
            }
        } else if ((cur->type != XML_ELEMENT_NODE) &&
                   (cur->type != XML_CDATA_SECTION_NODE)) {
            delete = cur;
            goto skip_children;
        }

        /*
         * Skip to next node
         */
        if (cur->children != NULL) {
            if ((cur->children->type != XML_ENTITY_DECL) &&
                (cur->children->type != XML_ENTITY_REF_NODE) &&
                (cur->children->type != XML_ENTITY_NODE)) {
                cur = cur->children;
                continue;
            }
        }
      skip_children:
        if (cur->next != NULL) {
            cur = cur->next;
            continue;
        }

        do {
            cur = cur->parent;
            if (cur == NULL)
                break;
            if (cur == root) {
                cur = NULL;
                break;
            }
            if (cur->next != NULL) {
                cur = cur->next;
                break;
            }
        } while (cur != NULL);
    }
    if (delete != NULL) {
        xmlUnlinkNode(delete);
        xmlFreeNode(delete);
        delete = NULL;
    }
}


static void
xmlSchemaClearSchemaDefaults(xmlSchemaPtr schema)
{
    if (schema->flags & XML_SCHEMAS_QUALIF_ELEM)
	schema->flags ^= XML_SCHEMAS_QUALIF_ELEM;

    if (schema->flags & XML_SCHEMAS_QUALIF_ATTR)
	schema->flags ^= XML_SCHEMAS_QUALIF_ATTR;

    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_EXTENSION)
	schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_EXTENSION;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION)
	schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_LIST)
	schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_LIST;
    if (schema->flags & XML_SCHEMAS_FINAL_DEFAULT_UNION)
	schema->flags ^= XML_SCHEMAS_FINAL_DEFAULT_UNION;

    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION)
	schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION;
    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION)
	schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION;
    if (schema->flags & XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION)
	schema->flags ^= XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION;
}

static int
xmlSchemaParseSchemaElement(xmlSchemaParserCtxtPtr ctxt,
			     xmlSchemaPtr schema,
			     xmlNodePtr node)
{
    xmlAttrPtr attr;
    const xmlChar *val;
    int res = 0, oldErrs = ctxt->nberrors;

    /*
    * Those flags should be moved to the parser context flags,
    * since they are not visible at the component level. I.e.
    * they are used if processing schema *documents* only.
    */
    res = xmlSchemaPValAttrID(ctxt, node, BAD_CAST "id");
    HFAILURE;

    /*
    * Since the version is of type xs:token, we won't bother to
    * check it.
    */
    /* REMOVED:
    attr = xmlSchemaGetPropNode(node, "version");
    if (attr != NULL) {
	res = xmlSchemaPValAttrNode(ctxt, NULL, NULL, attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_TOKEN), &val);
	HFAILURE;
    }
    */
    attr = xmlSchemaGetPropNode(node, "targetNamespace");
    if (attr != NULL) {
	res = xmlSchemaPValAttrNode(ctxt, NULL, attr,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI), NULL);
	HFAILURE;
	if (res != 0) {
	    ctxt->stop = XML_SCHEMAP_S4S_ATTR_INVALID_VALUE;
	    goto exit;
	}
    }
    attr = xmlSchemaGetPropNode(node, "elementFormDefault");
    if (attr != NULL) {
	val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	res = xmlSchemaPValAttrFormDefault(val, &schema->flags,
	    XML_SCHEMAS_QUALIF_ELEM);
	HFAILURE;
	if (res != 0) {
	    xmlSchemaPSimpleTypeErr(ctxt,
		XML_SCHEMAP_ELEMFORMDEFAULT_VALUE,
		NULL, (xmlNodePtr) attr, NULL,
		"(qualified | unqualified)", val, NULL, NULL, NULL);
	}
    }
    attr = xmlSchemaGetPropNode(node, "attributeFormDefault");
    if (attr != NULL) {
	val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	res = xmlSchemaPValAttrFormDefault(val, &schema->flags,
	    XML_SCHEMAS_QUALIF_ATTR);
	HFAILURE;
	if (res != 0) {
	    xmlSchemaPSimpleTypeErr(ctxt,
		XML_SCHEMAP_ATTRFORMDEFAULT_VALUE,
		NULL, (xmlNodePtr) attr, NULL,
		"(qualified | unqualified)", val, NULL, NULL, NULL);
	}
    }
    attr = xmlSchemaGetPropNode(node, "finalDefault");
    if (attr != NULL) {
	val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	res = xmlSchemaPValAttrBlockFinal(val, &(schema->flags), -1,
	    XML_SCHEMAS_FINAL_DEFAULT_EXTENSION,
	    XML_SCHEMAS_FINAL_DEFAULT_RESTRICTION,
	    -1,
	    XML_SCHEMAS_FINAL_DEFAULT_LIST,
	    XML_SCHEMAS_FINAL_DEFAULT_UNION);
	HFAILURE;
	if (res != 0) {
	    xmlSchemaPSimpleTypeErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		NULL, (xmlNodePtr) attr, NULL,
		"(#all | List of (extension | restriction | list | union))",
		val, NULL, NULL, NULL);
	}
    }
    attr = xmlSchemaGetPropNode(node, "blockDefault");
    if (attr != NULL) {
	val = xmlSchemaGetNodeContent(ctxt, (xmlNodePtr) attr);
	res = xmlSchemaPValAttrBlockFinal(val, &(schema->flags), -1,
	    XML_SCHEMAS_BLOCK_DEFAULT_EXTENSION,
	    XML_SCHEMAS_BLOCK_DEFAULT_RESTRICTION,
	    XML_SCHEMAS_BLOCK_DEFAULT_SUBSTITUTION, -1, -1);
	HFAILURE;
	if (res != 0) {
	    xmlSchemaPSimpleTypeErr(ctxt,
		XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
		NULL, (xmlNodePtr) attr, NULL,
		"(#all | List of (extension | restriction | substitution))",
		val, NULL, NULL, NULL);
	}
    }

exit:
    if (oldErrs != ctxt->nberrors)
	res = ctxt->err;
    return(res);
exit_failure:
    return(-1);
}

/**
 * xmlSchemaParseSchemaTopLevel:
 * @ctxt:  a schema validation context
 * @schema:  the schemas
 * @nodes:  the list of top level nodes
 *
 * Returns the internal XML Schema structure built from the resource or
 *         NULL in case of error
 */
static int
xmlSchemaParseSchemaTopLevel(xmlSchemaParserCtxtPtr ctxt,
                             xmlSchemaPtr schema, xmlNodePtr nodes)
{
    xmlNodePtr child;
    xmlSchemaAnnotPtr annot;
    int res = 0, oldErrs, tmpOldErrs;

    if ((ctxt == NULL) || (schema == NULL) || (nodes == NULL))
        return(-1);

    oldErrs = ctxt->nberrors;
    child = nodes;
    while ((IS_SCHEMA(child, "include")) ||
	   (IS_SCHEMA(child, "import")) ||
	   (IS_SCHEMA(child, "redefine")) ||
	   (IS_SCHEMA(child, "annotation"))) {
	if (IS_SCHEMA(child, "annotation")) {
	    annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	    if (schema->annot == NULL)
		schema->annot = annot;
	    else
		xmlSchemaFreeAnnot(annot);
	} else if (IS_SCHEMA(child, "import")) {
	    tmpOldErrs = ctxt->nberrors;
	    res = xmlSchemaParseImport(ctxt, schema, child);
	    HFAILURE;
	    HSTOP(ctxt);
	    if (tmpOldErrs != ctxt->nberrors)
		goto exit;
	} else if (IS_SCHEMA(child, "include")) {
	    tmpOldErrs = ctxt->nberrors;
	    res = xmlSchemaParseInclude(ctxt, schema, child);
	    HFAILURE;
	    HSTOP(ctxt);
	    if (tmpOldErrs != ctxt->nberrors)
		goto exit;
	} else if (IS_SCHEMA(child, "redefine")) {
	    tmpOldErrs = ctxt->nberrors;
	    res = xmlSchemaParseRedefine(ctxt, schema, child);
	    HFAILURE;
	    HSTOP(ctxt);
	    if (tmpOldErrs != ctxt->nberrors)
		goto exit;
	}
	child = child->next;
    }
    /*
    * URGENT TODO: Change the functions to return int results.
    * We need especially to catch internal errors.
    */
    while (child != NULL) {
	if (IS_SCHEMA(child, "complexType")) {
	    xmlSchemaParseComplexType(ctxt, schema, child, 1);
	    child = child->next;
	} else if (IS_SCHEMA(child, "simpleType")) {
	    xmlSchemaParseSimpleType(ctxt, schema, child, 1);
	    child = child->next;
	} else if (IS_SCHEMA(child, "element")) {
	    xmlSchemaParseElement(ctxt, schema, child, NULL, 1);
	    child = child->next;
	} else if (IS_SCHEMA(child, "attribute")) {
	    xmlSchemaParseGlobalAttribute(ctxt, schema, child);
	    child = child->next;
	} else if (IS_SCHEMA(child, "attributeGroup")) {
	    xmlSchemaParseAttributeGroupDefinition(ctxt, schema, child);
	    child = child->next;
	} else if (IS_SCHEMA(child, "group")) {
	    xmlSchemaParseModelGroupDefinition(ctxt, schema, child);
	    child = child->next;
	} else if (IS_SCHEMA(child, "notation")) {
	    xmlSchemaParseNotation(ctxt, schema, child);
	    child = child->next;
	} else {
	    xmlSchemaPContentErr(ctxt,
		XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
		NULL, child->parent, child,
		NULL, "((include | import | redefine | annotation)*, "
		"(((simpleType | complexType | group | attributeGroup) "
		"| element | attribute | notation), annotation*)*)");
	    child = child->next;
	}
	while (IS_SCHEMA(child, "annotation")) {
	    /*
	    * TODO: We should add all annotations.
	    */
	    annot = xmlSchemaParseAnnotation(ctxt, child, 1);
	    if (schema->annot == NULL)
		schema->annot = annot;
	    else
		xmlSchemaFreeAnnot(annot);
	    child = child->next;
	}
    }
exit:
    ctxt->ctxtType = NULL;
    if (oldErrs != ctxt->nberrors)
	res = ctxt->err;
    return(res);
exit_failure:
    return(-1);
}

static xmlSchemaSchemaRelationPtr
xmlSchemaSchemaRelationCreate(void)
{
    xmlSchemaSchemaRelationPtr ret;

    ret = (xmlSchemaSchemaRelationPtr)
	xmlMalloc(sizeof(xmlSchemaSchemaRelation));
    if (ret == NULL) {
	xmlSchemaPErrMemory(NULL, "allocating schema relation", NULL);
	return(NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaSchemaRelation));
    return(ret);
}

#if 0
static void
xmlSchemaSchemaRelationFree(xmlSchemaSchemaRelationPtr rel)
{
    xmlFree(rel);
}
#endif

static void
xmlSchemaRedefListFree(xmlSchemaRedefPtr redef)
{
    xmlSchemaRedefPtr prev;

    while (redef != NULL) {
	prev = redef;
	redef = redef->next;
	xmlFree(prev);
    }
}

static void
xmlSchemaConstructionCtxtFree(xmlSchemaConstructionCtxtPtr con)
{
    /*
    * After the construction context has been freed, there will be
    * no schema graph available any more. Only the schema buckets
    * will stay alive, which are put into the "schemasImports" and
    * "includes" slots of the xmlSchema.
    */
    if (con->buckets != NULL)
	xmlSchemaItemListFree(con->buckets);
    if (con->pending != NULL)
	xmlSchemaItemListFree(con->pending);
    if (con->substGroups != NULL)
	xmlHashFree(con->substGroups,
	    (xmlHashDeallocator) xmlSchemaSubstGroupFree);
    if (con->redefs != NULL)
	xmlSchemaRedefListFree(con->redefs);
    if (con->dict != NULL)
	xmlDictFree(con->dict);
    xmlFree(con);
}

static xmlSchemaConstructionCtxtPtr
xmlSchemaConstructionCtxtCreate(xmlDictPtr dict)
{
    xmlSchemaConstructionCtxtPtr ret;

    ret = (xmlSchemaConstructionCtxtPtr)
	xmlMalloc(sizeof(xmlSchemaConstructionCtxt));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL,
	    "allocating schema construction context", NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaConstructionCtxt));

    ret->buckets = xmlSchemaItemListCreate();
    if (ret->buckets == NULL) {
	xmlSchemaPErrMemory(NULL,
	    "allocating list of schema buckets", NULL);
	xmlFree(ret);
        return (NULL);
    }
    ret->pending = xmlSchemaItemListCreate();
    if (ret->pending == NULL) {
	xmlSchemaPErrMemory(NULL,
	    "allocating list of pending global components", NULL);
	xmlSchemaConstructionCtxtFree(ret);
        return (NULL);
    }
    ret->dict = dict;
    xmlDictReference(dict);
    return(ret);
}

static xmlSchemaParserCtxtPtr
xmlSchemaParserCtxtCreate(void)
{
    xmlSchemaParserCtxtPtr ret;

    ret = (xmlSchemaParserCtxtPtr) xmlMalloc(sizeof(xmlSchemaParserCtxt));
    if (ret == NULL) {
        xmlSchemaPErrMemory(NULL, "allocating schema parser context",
                            NULL);
        return (NULL);
    }
    memset(ret, 0, sizeof(xmlSchemaParserCtxt));
    ret->type = XML_SCHEMA_CTXT_PARSER;
    ret->attrProhibs = xmlSchemaItemListCreate();
    if (ret->attrProhibs == NULL) {
	xmlFree(ret);
	return(NULL);
    }
    return(ret);
}

/**
 * xmlSchemaNewParserCtxtUseDict:
 * @URL:  the location of the schema
 * @dict: the dictionary to be used
 *
 * Create an XML Schemas parse context for that file/resource expected
 * to contain an XML Schemas file.
 *
 * Returns the parser context or NULL in case of error
 */
static xmlSchemaParserCtxtPtr
xmlSchemaNewParserCtxtUseDict(const char *URL, xmlDictPtr dict)
{
    xmlSchemaParserCtxtPtr ret;

    ret = xmlSchemaParserCtxtCreate();
    if (ret == NULL)
        return (NULL);
    ret->dict = dict;
    xmlDictReference(dict);
    if (URL != NULL)
	ret->URL = xmlDictLookup(dict, (const xmlChar *) URL, -1);
    return (ret);
}

static int
xmlSchemaCreatePCtxtOnVCtxt(xmlSchemaValidCtxtPtr vctxt)
{
    if (vctxt->pctxt == NULL) {
        if (vctxt->schema != NULL)
	    vctxt->pctxt =
		xmlSchemaNewParserCtxtUseDict("*", vctxt->schema->dict);
	else
	    vctxt->pctxt = xmlSchemaNewParserCtxt("*");
	if (vctxt->pctxt == NULL) {
	    VERROR_INT("xmlSchemaCreatePCtxtOnVCtxt",
		"failed to create a temp. parser context");
	    return (-1);
	}
	/* TODO: Pass user data. */
	xmlSchemaSetParserErrors(vctxt->pctxt, vctxt->error,
	    vctxt->warning, vctxt->errCtxt);
	xmlSchemaSetParserStructuredErrors(vctxt->pctxt, vctxt->serror,
	    vctxt->errCtxt);
    }
    return (0);
}

/**
 * xmlSchemaGetSchemaBucket:
 * @pctxt: the schema parser context
 * @schemaLocation: the URI of the schema document
 *
 * Returns a schema bucket if it was already parsed.
 *
 * Returns a schema bucket if it was already parsed from
 *         @schemaLocation, NULL otherwise.
 */
static xmlSchemaBucketPtr
xmlSchemaGetSchemaBucket(xmlSchemaParserCtxtPtr pctxt,
			    const xmlChar *schemaLocation)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
	return(NULL);
    else {
	int i;
	for (i = 0; i < list->nbItems; i++) {
	    cur = (xmlSchemaBucketPtr) list->items[i];
	    /* Pointer comparison! */
	    if (cur->schemaLocation == schemaLocation)
		return(cur);
	}
    }
    return(NULL);
}

static xmlSchemaBucketPtr
xmlSchemaGetChameleonSchemaBucket(xmlSchemaParserCtxtPtr pctxt,
				     const xmlChar *schemaLocation,
				     const xmlChar *targetNamespace)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
	return(NULL);
    else {
	int i;
	for (i = 0; i < list->nbItems; i++) {
	    cur = (xmlSchemaBucketPtr) list->items[i];
	    /* Pointer comparison! */
	    if ((cur->origTargetNamespace == NULL) &&
		(cur->schemaLocation == schemaLocation) &&
		(cur->targetNamespace == targetNamespace))
		return(cur);
	}
    }
    return(NULL);
}


#define IS_BAD_SCHEMA_DOC(b) \
    (((b)->doc == NULL) && ((b)->schemaLocation != NULL))

static xmlSchemaBucketPtr
xmlSchemaGetSchemaBucketByTNS(xmlSchemaParserCtxtPtr pctxt,
				 const xmlChar *targetNamespace,
				 int imported)
{
    xmlSchemaBucketPtr cur;
    xmlSchemaItemListPtr list;

    list = pctxt->constructor->buckets;
    if (list->nbItems == 0)
	return(NULL);
    else {
	int i;
	for (i = 0; i < list->nbItems; i++) {
	    cur = (xmlSchemaBucketPtr) list->items[i];
	    if ((! IS_BAD_SCHEMA_DOC(cur)) &&
		(cur->origTargetNamespace == targetNamespace) &&
		((imported && cur->imported) ||
		 ((!imported) && (!cur->imported))))
		return(cur);
	}
    }
    return(NULL);
}

static int
xmlSchemaParseNewDocWithContext(xmlSchemaParserCtxtPtr pctxt,
		     xmlSchemaPtr schema,
		     xmlSchemaBucketPtr bucket)
{
    int oldFlags;
    xmlDocPtr oldDoc;
    xmlNodePtr node;
    int ret, oldErrs;
    xmlSchemaBucketPtr oldbucket = pctxt->constructor->bucket;

    /*
    * Save old values; reset the *main* schema.
    * URGENT TODO: This is not good; move the per-document information
    * to the parser. Get rid of passing the main schema to the
    * parsing functions.
    */
    oldFlags = schema->flags;
    oldDoc = schema->doc;
    if (schema->flags != 0)
	xmlSchemaClearSchemaDefaults(schema);
    schema->doc = bucket->doc;
    pctxt->schema = schema;
    /*
    * Keep the current target namespace on the parser *not* on the
    * main schema.
    */
    pctxt->targetNamespace = bucket->targetNamespace;
    WXS_CONSTRUCTOR(pctxt)->bucket = bucket;

    if ((bucket->targetNamespace != NULL) &&
	xmlStrEqual(bucket->targetNamespace, xmlSchemaNs)) {
	/*
	* We are parsing the schema for schemas!
	*/
	pctxt->isS4S = 1;
    }
    /* Mark it as parsed, even if parsing fails. */
    bucket->parsed++;
    /* Compile the schema doc. */
    node = xmlDocGetRootElement(bucket->doc);
    ret = xmlSchemaParseSchemaElement(pctxt, schema, node);
    if (ret != 0)
	goto exit;
    /* An empty schema; just get out. */
    if (node->children == NULL)
	goto exit;
    oldErrs = pctxt->nberrors;
    ret = xmlSchemaParseSchemaTopLevel(pctxt, schema, node->children);
    if (ret != 0)
	goto exit;
    /*
    * TODO: Not nice, but I'm not 100% sure we will get always an error
    * as a result of the obove functions; so better rely on pctxt->err
    * as well.
    */
    if ((ret == 0) && (oldErrs != pctxt->nberrors)) {
	ret = pctxt->err;
	goto exit;
    }

exit:
    WXS_CONSTRUCTOR(pctxt)->bucket = oldbucket;
    /* Restore schema values. */
    schema->doc = oldDoc;
    schema->flags = oldFlags;
    return(ret);
}

static int
xmlSchemaParseNewDoc(xmlSchemaParserCtxtPtr pctxt,
		     xmlSchemaPtr schema,
		     xmlSchemaBucketPtr bucket)
{
    xmlSchemaParserCtxtPtr newpctxt;
    int res = 0;

    if (bucket == NULL)
	return(0);
    if (bucket->parsed) {
	PERROR_INT("xmlSchemaParseNewDoc",
	    "reparsing a schema doc");
	return(-1);
    }
    if (bucket->doc == NULL) {
	PERROR_INT("xmlSchemaParseNewDoc",
	    "parsing a schema doc, but there's no doc");
	return(-1);
    }
    if (pctxt->constructor == NULL) {
	PERROR_INT("xmlSchemaParseNewDoc",
	    "no constructor");
	return(-1);
    }
    /* Create and init the temporary parser context. */
    newpctxt = xmlSchemaNewParserCtxtUseDict(
	(const char *) bucket->schemaLocation, pctxt->dict);
    if (newpctxt == NULL)
	return(-1);
    newpctxt->constructor = pctxt->constructor;
    /*
    * TODO: Can we avoid that the parser knows about the main schema?
    * It would be better if he knows about the current schema bucket
    * only.
    */
    newpctxt->schema = schema;
    xmlSchemaSetParserErrors(newpctxt, pctxt->error, pctxt->warning,
	pctxt->errCtxt);
    xmlSchemaSetParserStructuredErrors(newpctxt, pctxt->serror,
	pctxt->errCtxt);
    newpctxt->counter = pctxt->counter;


    res = xmlSchemaParseNewDocWithContext(newpctxt, schema, bucket);

    /* Channel back errors and cleanup the temporary parser context. */
    if (res != 0)
	pctxt->err = res;
    pctxt->nberrors += newpctxt->nberrors;
    pctxt->counter = newpctxt->counter;
    newpctxt->constructor = NULL;
    /* Free the parser context. */
    xmlSchemaFreeParserCtxt(newpctxt);
    return(res);
}

static void
xmlSchemaSchemaRelationAddChild(xmlSchemaBucketPtr bucket,
				xmlSchemaSchemaRelationPtr rel)
{
    xmlSchemaSchemaRelationPtr cur = bucket->relations;

    if (cur == NULL) {
	bucket->relations = rel;
	return;
    }
    while (cur->next != NULL)
	cur = cur->next;
    cur->next = rel;
}


static const xmlChar *
xmlSchemaBuildAbsoluteURI(xmlDictPtr dict, const xmlChar* location,
			  xmlNodePtr ctxtNode)
{
    /*
    * Build an absolue location URI.
    */
    if (location != NULL) {
	if (ctxtNode == NULL)
	    return(location);
	else {
	    xmlChar *base, *URI;
	    const xmlChar *ret = NULL;

	    base = xmlNodeGetBase(ctxtNode->doc, ctxtNode);
	    if (base == NULL) {
		URI = xmlBuildURI(location, ctxtNode->doc->URL);
	    } else {
		URI = xmlBuildURI(location, base);
		xmlFree(base);
	    }
	    if (URI != NULL) {
		ret = xmlDictLookup(dict, URI, -1);
		xmlFree(URI);
		return(ret);
	    }
	}
    }
    return(NULL);
}



/**
 * xmlSchemaAddSchemaDoc:
 * @pctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * Parse an included (and to-be-redefined) XML schema document.
 *
 * Returns 0 on success, a positive error code on errors and
 *         -1 in case of an internal or API error.
 */

static int
xmlSchemaAddSchemaDoc(xmlSchemaParserCtxtPtr pctxt,
		int type, /* import or include or redefine */
		const xmlChar *schemaLocation,
		xmlDocPtr schemaDoc,
		const char *schemaBuffer,
		int schemaBufferLen,
		xmlNodePtr invokingNode,
		const xmlChar *sourceTargetNamespace,
		const xmlChar *importNamespace,
		xmlSchemaBucketPtr *bucket)
{
    const xmlChar *targetNamespace = NULL;
    xmlSchemaSchemaRelationPtr relation = NULL;
    xmlDocPtr doc = NULL;
    int res = 0, err = 0, located = 0, preserveDoc = 0;
    xmlSchemaBucketPtr bkt = NULL;

    if (bucket != NULL)
	*bucket = NULL;

    switch (type) {
	case XML_SCHEMA_SCHEMA_IMPORT:
	case XML_SCHEMA_SCHEMA_MAIN:
	    err = XML_SCHEMAP_SRC_IMPORT;
	    break;
	case XML_SCHEMA_SCHEMA_INCLUDE:
	    err = XML_SCHEMAP_SRC_INCLUDE;
	    break;
	case XML_SCHEMA_SCHEMA_REDEFINE:
	    err = XML_SCHEMAP_SRC_REDEFINE;
	    break;
    }


    /* Special handling for the main schema:
    * skip the location and relation logic and just parse the doc.
    * We need just a bucket to be returned in this case.
    */
    if ((type == XML_SCHEMA_SCHEMA_MAIN) || (! WXS_HAS_BUCKETS(pctxt)))
	goto doc_load;

    /* Note that we expect the location to be an absulute URI. */
    if (schemaLocation != NULL) {
	bkt = xmlSchemaGetSchemaBucket(pctxt, schemaLocation);
	if ((bkt != NULL) &&
	    (pctxt->constructor->bucket == bkt)) {
	    /* Report self-imports/inclusions/redefinitions. */

	    xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
		invokingNode, NULL,
		"The schema must not import/include/redefine itself",
		NULL, NULL);
	    goto exit;
	}
    }
    /*
    * Create a relation for the graph of schemas.
    */
    relation = xmlSchemaSchemaRelationCreate();
    if (relation == NULL)
	return(-1);
    xmlSchemaSchemaRelationAddChild(pctxt->constructor->bucket,
	relation);
    relation->type = type;

    /*
    * Save the namespace import information.
    */
    if (WXS_IS_BUCKET_IMPMAIN(type)) {
	relation->importNamespace = importNamespace;
	if (schemaLocation == NULL) {
	    /*
	    * No location; this is just an import of the namespace.
	    * Note that we don't assign a bucket to the relation
	    * in this case.
	    */
	    goto exit;
	}
	targetNamespace = importNamespace;
    }

    /* Did we already fetch the doc? */
    if (bkt != NULL) {
	/* TODO: The following nasty cases will produce an error. */
	if ((WXS_IS_BUCKET_IMPMAIN(type)) && (! bkt->imported)) {
	    /* We included/redefined and then try to import a schema. */
	    if (schemaLocation == NULL)
		schemaLocation = BAD_CAST "in_memory_buffer";
	    xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
		invokingNode, NULL,
		"The schema document '%s' cannot be imported, since "
		"it was already included or redefined",
		schemaLocation, NULL);
	    goto exit;
	} else if ((! WXS_IS_BUCKET_IMPMAIN(type)) && (bkt->imported)) {
	    /* We imported and then try to include/redefine a schema. */
	    if (schemaLocation == NULL)
		schemaLocation = BAD_CAST "in_memory_buffer";
	    xmlSchemaCustomErr(ACTXT_CAST pctxt, err,
		invokingNode, NULL,
		"The schema document '%s' cannot be included or "
		"redefined, since it was already imported",
		schemaLocation, NULL);
	    goto exit;
	}
    }

    if (WXS_IS_BUCKET_IMPMAIN(type)) {
	/*
	* Given that the schemaLocation [attribute] is only a hint, it is open
	* to applications to ignore all but the first <import> for a given
	* namespace, regardless of the actual value of schemaLocation, but
	* such a strategy risks missing useful information when new
	* schemaLocations are offered.
	*
	* We will use the first <import> that comes with a location.
	* Further <import>s *with* a location, will result in an error.
	* TODO: Better would be to just report a warning here, but
	* we'll try it this way until someone complains.
	*
	* Schema Document Location Strategy:
	* 3 Based on the namespace name, identify an existing schema document,
	* either as a resource which is an XML document or a <schema> element
	* information item, in some local schema repository;
	* 5 Attempt to resolve the namespace name to locate such a resource.
	*
	* NOTE: (3) and (5) are not supported.
	*/
	if (bkt != NULL) {
	    relation->bucket = bkt;
	    goto exit;
	}
	bkt = xmlSchemaGetSchemaBucketByTNS(pctxt,
	    importNamespace, 1);

	if (bkt != NULL) {
	    relation->bucket = bkt;
	    if (bkt->schemaLocation == NULL) {
		/* First given location of the schema; load the doc. */
		bkt->schemaLocation = schemaLocation;
	    } else {
		if (!xmlStrEqual(schemaLocation,
		    bkt->schemaLocation)) {
		    /*
		    * Additional location given; just skip it.
		    * URGENT TODO: We should report a warning here.
		    * res = XML_SCHEMAP_SRC_IMPORT;
		    */
		    if (schemaLocation == NULL)
			schemaLocation = BAD_CAST "in_memory_buffer";

		    xmlSchemaCustomWarning(ACTXT_CAST pctxt,
			XML_SCHEMAP_WARN_SKIP_SCHEMA,
			invokingNode, NULL,
			"Skipping import of schema located at '%s' for the "
			"namespace '%s', since this namespace was already "
			"imported with the schema located at '%s'",
			schemaLocation, importNamespace, bkt->schemaLocation);
		}
		goto exit;
	    }
	}
	/*
	* No bucket + first location: load the doc and create a
	* bucket.
	*/
    } else {
	/* <include> and <redefine> */
	if (bkt != NULL) {

	    if ((bkt->origTargetNamespace == NULL) &&
		(bkt->targetNamespace != sourceTargetNamespace)) {
		xmlSchemaBucketPtr chamel;

		/*
		* Chameleon include/redefine: skip loading only if it was
		* aleady build for the targetNamespace of the including
		* schema.
		*/
		/*
		* URGENT TODO: If the schema is a chameleon-include then copy
		* the components into the including schema and modify the
		* targetNamespace of those components, do nothing otherwise.
		* NOTE: This is currently worked-around by compiling the
		* chameleon for every destinct including targetNamespace; thus
		* not performant at the moment.
		* TODO: Check when the namespace in wildcards for chameleons
		* needs to be converted: before we built wildcard intersections
		* or after.
		*   Answer: after!
		*/
		chamel = xmlSchemaGetChameleonSchemaBucket(pctxt,
		    schemaLocation, sourceTargetNamespace);
		if (chamel != NULL) {
		    /* A fitting chameleon was already parsed; NOP. */
		    relation->bucket = chamel;
		    goto exit;
		}
		/*
		* We need to parse the chameleon again for a different
		* targetNamespace.
		* CHAMELEON TODO: Optimize this by only parsing the
		* chameleon once, and then copying the components to
		* the new targetNamespace.
		*/
		bkt = NULL;
	    } else {
		relation->bucket = bkt;
		goto exit;
	    }
	}
    }
    if ((bkt != NULL) && (bkt->doc != NULL)) {
	PERROR_INT("xmlSchemaAddSchemaDoc",
	    "trying to load a schema doc, but a doc is already "
	    "assigned to the schema bucket");
	goto exit_failure;
    }

doc_load:
    /*
    * Load the document.
    */
    if (schemaDoc != NULL) {
	doc = schemaDoc;
	/* Don' free this one, since it was provided by the caller. */
	preserveDoc = 1;
	/* TODO: Does the context or the doc hold the location? */
	if (schemaDoc->URL != NULL)
	    schemaLocation = xmlDictLookup(pctxt->dict,
		schemaDoc->URL, -1);
        else
	    schemaLocation = BAD_CAST "in_memory_buffer";
    } else if ((schemaLocation != NULL) || (schemaBuffer != NULL)) {
	xmlParserCtxtPtr parserCtxt;

	parserCtxt = xmlNewParserCtxt();
	if (parserCtxt == NULL) {
	    xmlSchemaPErrMemory(NULL, "xmlSchemaGetDoc, "
		"allocating a parser context", NULL);
	    goto exit_failure;
	}
	if ((pctxt->dict != NULL) && (parserCtxt->dict != NULL)) {
	    /*
	    * TODO: Do we have to burden the schema parser dict with all
	    * the content of the schema doc?
	    */
	    xmlDictFree(parserCtxt->dict);
	    parserCtxt->dict = pctxt->dict;
	    xmlDictReference(parserCtxt->dict);
	}
	if (schemaLocation != NULL) {
	    /* Parse from file. */
	    doc = xmlCtxtReadFile(parserCtxt, (const char *) schemaLocation,
		NULL, SCHEMAS_PARSE_OPTIONS);
	} else if (schemaBuffer != NULL) {
	    /* Parse from memory buffer. */
	    doc = xmlCtxtReadMemory(parserCtxt, schemaBuffer, schemaBufferLen,
		NULL, NULL, SCHEMAS_PARSE_OPTIONS);
	    schemaLocation = xmlStrdup(BAD_CAST "in_memory_buffer");
	    if (doc != NULL)
		doc->URL = schemaLocation;
	}
	/*
	* For <import>:
	* 2.1 The referent is (a fragment of) a resource which is an
	* XML document (see clause 1.1), which in turn corresponds to
	* a <schema> element information item in a well-formed information
	* set, which in turn corresponds to a valid schema.
	* TODO: (2.1) fragments of XML documents are not supported.
	*
	* 2.2 The referent is a <schema> element information item in
	* a well-formed information set, which in turn corresponds
	* to a valid schema.
	* TODO: (2.2) is not supported.
	*/
	if (doc == NULL) {
	    xmlErrorPtr lerr;
	    lerr = xmlGetLastError();
	    /*
	    * Check if this a parser error, or if the document could
	    * just not be located.
	    * TODO: Try to find specific error codes to react only on
	    * localisation failures.
	    */
	    if ((lerr == NULL) || (lerr->domain != XML_FROM_IO)) {
		/*
		* We assume a parser error here.
		*/
		located = 1;
		/* TODO: Error code ?? */
		res = XML_SCHEMAP_SRC_IMPORT_2_1;
		xmlSchemaCustomErr(ACTXT_CAST pctxt, res,
		    invokingNode, NULL,
		    "Failed to parse the XML resource '%s'",
		    schemaLocation, NULL);
	    }
	}
	xmlFreeParserCtxt(parserCtxt);
	if ((doc == NULL) && located)
	    goto exit_error;
    } else {
	xmlSchemaPErr(pctxt, NULL,
	    XML_SCHEMAP_NOTHING_TO_PARSE,
	    "No information for parsing was provided with the "
	    "given schema parser context.\n",
	    NULL, NULL);
	goto exit_failure;
    }
    /*
    * Preprocess the document.
    */
    if (doc != NULL) {
	xmlNodePtr docElem = NULL;

	located = 1;
	docElem = xmlDocGetRootElement(doc);
	if (docElem == NULL) {
	    xmlSchemaCustomErr(ACTXT_CAST pctxt, XML_SCHEMAP_NOROOT,
		invokingNode, NULL,
		"The document '%s' has no document element",
		schemaLocation, NULL);
	    goto exit_error;
	}
	/*
	* Remove all the blank text nodes.
	*/
	xmlSchemaCleanupDoc(pctxt, docElem);
	/*
	* Check the schema's top level element.
	*/
	if (!IS_SCHEMA(docElem, "schema")) {
	    xmlSchemaCustomErr(ACTXT_CAST pctxt, XML_SCHEMAP_NOT_SCHEMA,
		invokingNode, NULL,
		"The XML document '%s' is not a schema document",
		schemaLocation, NULL);
	    goto exit_error;
	}
	/*
	* Note that we don't apply a type check for the
	* targetNamespace value here.
	*/
	targetNamespace = xmlSchemaGetProp(pctxt, docElem,
	    "targetNamespace");
    }

/* after_doc_loading: */
    if ((bkt == NULL) && located) {
	/* Only create a bucket if the schema was located. */
        bkt = xmlSchemaBucketCreate(pctxt, type,
	    targetNamespace);
	if (bkt == NULL)
	    goto exit_failure;
    }
    if (bkt != NULL) {
	bkt->schemaLocation = schemaLocation;
	bkt->located = located;
	if (doc != NULL) {
	    bkt->doc = doc;
	    bkt->targetNamespace = targetNamespace;
	    bkt->origTargetNamespace = targetNamespace;
	    if (preserveDoc)
		bkt->preserveDoc = 1;
	}
	if (WXS_IS_BUCKET_IMPMAIN(type))
	    bkt->imported++;
	    /*
	    * Add it to the graph of schemas.
	    */
	if (relation != NULL)
	    relation->bucket = bkt;
    }

exit:
    /*
    * Return the bucket explicitely; this is needed for the
    * main schema.
    */
    if (bucket != NULL)
	*bucket = bkt;
    return (0);

exit_error:
    if ((doc != NULL) && (! preserveDoc)) {
	xmlFreeDoc(doc);
	if (bkt != NULL)
	    bkt->doc = NULL;
    }
    return(pctxt->err);

exit_failure:
    if ((doc != NULL) && (! preserveDoc)) {
	xmlFreeDoc(doc);
	if (bkt != NULL)
	    bkt->doc = NULL;
    }
    return (-1);
}

/**
 * xmlSchemaParseImport:
 * @ctxt:  a schema validation context
 * @schema:  the schema being built
 * @node:  a subtree containing XML Schema informations
 *
 * parse a XML schema Import definition
 * *WARNING* this interface is highly subject to change
 *
 * Returns 0 in case of success, a positive error code if
 * not valid and -1 in case of an internal error.
 */
static int
xmlSchemaParseImport(xmlSchemaParserCtxtPtr pctxt, xmlSchemaPtr schema,
                     xmlNodePtr node)
{
    xmlNodePtr child;
    const xmlChar *namespaceName = NULL, *schemaLocation = NULL;
    const xmlChar *thisTargetNamespace;
    xmlAttrPtr attr;
    int ret = 0;
    xmlSchemaBucketPtr bucket = NULL;

    if ((pctxt == NULL) || (schema == NULL) || (node == NULL))
        return (-1);

    /*
    * Check for illegal attributes.
    */
    attr = node->properties;
    while (attr != NULL) {
	if (attr->ns == NULL) {
	    if ((!xmlStrEqual(attr->name, BAD_CAST "id")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "namespace")) &&
		(!xmlStrEqual(attr->name, BAD_CAST "schemaLocation"))) {
		xmlSchemaPIllegalAttrErr(pctxt,
		    XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	    }
	} else if (xmlStrEqual(attr->ns->href, xmlSchemaNs)) {
	    xmlSchemaPIllegalAttrErr(pctxt,
		XML_SCHEMAP_S4S_ATTR_NOT_ALLOWED, NULL, attr);
	}
	attr = attr->next;
    }
    /*
    * Extract and validate attributes.
    */
    if (xmlSchemaPValAttr(pctxt, NULL, node,
	"namespace", xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
	&namespaceName) != 0) {
	xmlSchemaPSimpleTypeErr(pctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    NULL, node,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
	    NULL, namespaceName, NULL, NULL, NULL);
	return (pctxt->err);
    }

    if (xmlSchemaPValAttr(pctxt, NULL, node,
	"schemaLocation", xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
	&schemaLocation) != 0) {
	xmlSchemaPSimpleTypeErr(pctxt,
	    XML_SCHEMAP_S4S_ATTR_INVALID_VALUE,
	    NULL, node,
	    xmlSchemaGetBuiltInType(XML_SCHEMAS_ANYURI),
	    NULL, namespaceName, NULL, NULL, NULL);
	return (pctxt->err);
    }
    /*
    * And now for the children...
    */
    child = node->children;
    if (IS_SCHEMA(child, "annotation")) {
        /*
         * the annotation here is simply discarded ...
	 * TODO: really?
         */
        child = child->next;
    }
    if (child != NULL) {
	xmlSchemaPContentErr(pctxt,
	    XML_SCHEMAP_S4S_ELEM_NOT_ALLOWED,
	    NULL, node, child, NULL,
	    "(annotation?)");
    }
    /*
    * Apply additional constraints.
    *
    * Note that it is important to use the original @targetNamespace
    * (or none at all), to rule out imports of schemas _with_ a
    * @targetNamespace if the importing schema is a chameleon schema
    * (with no @targetNamespace).
    */
    thisTargetNamespace = WXS_BUCKET(pctxt)->origTargetNamespace;
    if (namespaceName != NULL) {
	/*
	* 1.1 If the namespace [attribute] is present, then its actual value
	* must not match the actual value of the enclosing <schema>'s
	* targetNamespace [attribute].
	*/
	if (xmlStrEqual(thisTargetNamespace, namespaceName)) {
	    xmlSchemaPCustomErr(pctxt,
		XML_SCHEMAP_SRC_IMPORT_1_1,
		NULL, node,
		"The value of the attribute 'namespace' must not match "
		"the target namespace '%s' of the importing schema",
		thisTargetNamespace);
	    return (pctxt->err);
	}
    } else {
	/*
	* 1.2 If the namespace [attribute] is not present, then the enclosing
	* <schema> must have a targetNamespace [attribute].
	*/
	if (thisTargetNamespace == NULL) {
	    xmlSchemaPCustomErr(pctxt,
		XML_SCHEMAP_SRC_IMPORT_1_2,
		NULL, node,
		"The attribute 'namespace' must be existent if "
		"the importing schema has no target namespace",
		NULL);
	    return (pctxt->err);
	}