1 <!DOCTYPE book [ 2 <!ELEMENT book (doc*)> 3 <!ELEMENT doc (isid*)> 4 <!ELEMENT isid EMPTY> 5 <!ATTLIST isid myid ID #IMPLIED> 6 ]> 7 <book> 8 <doc> 9 <isid myid="mine"/> 10 <isid myid="dup"/> 11 </doc> 12 <!-- including another XML document with IDs --> 13 <xinclude:include xmlns:xinclude="http://www.w3.org/2001/XInclude" 14 href="../ents/ids.xml"/> 15 </book> 16
