> From your DTD:
> 
> Ron> <!ELEMENT NotationType (NotationValue+)>
> Ron> <!ELEMENT NotationValue (#PCDATA)>
> Ron> <!ATTLIST NotationValue
> Ron>           Notation IDREF #REQUIRED>
> 
> In particular, NotationType contains a list of Notation values.  Why?
> What's wrong with the following?
>
> <!ELEMENT NotationType EMPTY>
1) Oops -- I got this right in the XML file but not in the DTD.  NotationType is 
now EMPTY.
2) Notice that the Notation attribute is type IDREF.  This is valid only if 
notations themselves must be unique (and hence can be identified by an ID 
attribute).  I posted a question about this yesterday but have not yet received 
an answer.
-- Ron Bourret