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libxml2
<?xml version="1.0"?> <!DOCTYPE doc [ <!ELEMENT doc (src | dest)*> <!ELEMENT src EMPTY> <!ELEMENT dest EMPTY> <!ATTLIST src ref IDREF #IMPLIED> <!ATTLIST dest id ID #IMPLIED> <!ENTITY dest SYSTEM "dtds/destfoo.ent"> ]> <doc> <src ref="foo"/> &dest; <src ref="foo"/> </doc>