<?xml version="1.0"?> <!DOCTYPE foo [ <!ELEMENT foo (bar)> <!ATTLIST foo id CDATA #IMPLIED> <!ELEMENT bar (#PCDATA|cheese)*> <!ATTLIST bar id ID #REQUIRED> <!ELEMENT cheese (#PCDATA)> <!ATTLIST cheese kind ID #IMPLIED> ]> <foo id="foobar"> <bar id="fb1"> baz <cheese kind="edam">gouda</cheese> baz <cheese kind="gouda">cheddar</cheese> baz </bar> </foo>