1<!-- 2This gets parsed without complaint: 3<!ELEMENT pfx:notes ( #PCDATA | note | pfx:note )* > 4--> 5 6<!-- 7This triggers a diagnostic: 8notes.dtd:13: validity error : Definition of notes has duplicate 9references 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