1 <!-- 2 This gets parsed without complaint: 3 <!ELEMENT pfx:notes ( #PCDATA | note | pfx:note )* > 4 --> 5 6 <!-- 7 This triggers a diagnostic: 8 notes.dtd:13: validity error : Definition of notes has duplicate 9 references of note 10 <!ELEMENT pfx:notes ( #PCDATA | pfx:note | note )* > 11 --> 12 13 <!ELEMENT pfx:notes ( #PCDATA | pfx:note | note )* > 14 15 <!ATTLIST notes 16 xmlns:pfx CDATA #FIXED 'http://namespace/uri/here' 17 > 18 <!ELEMENT note EMPTY > 19 <!ELEMENT pfx:note EMPTY > 20