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/opt/alt/libxml2/usr/share/doc/alt-libxml2-devel/examples/

//opt/alt/libxml2/usr/share/doc/alt-libxml2-devel/examples/test2.xml

 <!DOCTYPE doc [
<!ELEMENT doc (src | dest)*>
<!ELEMENT src EMPTY>
<!ELEMENT dest EMPTY>
<!ATTLIST src ref IDREF #IMPLIED>
<!ATTLIST dest id ID #IMPLIED>
]>
<doc>
  <src ref="foo"/>
  <dest id="foo"/>
  <src ref="foo"/>
</doc>