>I need to create DTDs that are extensible...
I've got the same problem: I essentially want a "standard" DTD
for an application domain that tolerates private extensions added
by individual implementors.
I had thought of doing it with something like
<PRIVATE TAG="mytag">XXX</PRIVATE>; this
has the advantage it flags it up as a private extension, but
it's certainly ugly in other ways. Fortunately I'm not using
attributes extensively, it's only private elements I'm really
concerned with.
Mike Kay