<!– This gets parsed without complaint: <!ELEMENT pfx:notes ( #PCDATA | note | pfx:note )* > –>

<!– This triggers a diagnostic: notes.dtd:13: validity error : Definition of notes has duplicate references of note <!ELEMENT pfx:notes ( #PCDATA | pfx:note | note )* > –>

<!ELEMENT pfx:notes ( #PCDATA | pfx:note | note )* >

<!ATTLIST notes

xmlns:pfx CDATA #FIXED 'http://namespace/uri/here'

> <!ELEMENT note EMPTY > <!ELEMENT pfx:note EMPTY >