<!--
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 >