Conformance in XML processors

David Megginson ak117 at
Mon Jan 19 17:27:26 GMT 1998

Matthew Gertner writes:

 > >This doesn't really address the point, though.  If notations and data
 > >attributes are optional, then either support for embedding non-XML
 > >objects is also optional, or notations and data attributes are not the
 > >preferred way of embedding non-XML objects.  If they are not the
 > >preferred way (you probably rightly suggest that embedded URLs and
 > >MIME/HTTP will be more popular), then why does the spec include them
 > >at all, and cause so much unnecessary confusion among non-SGML people?
 > I wonder about this as well. The only explanation I have heard is that
 > people should be forced to include a list of external entities in the
 > document prolog, since they will regret it 20 years down the road if they
 > don't. I must say, this sounds I tad prescriptive to me...

Actually, given the instability of links on the WWW, you will likely
regret it 20 days down the road if you do not collect references in
one place (preferably a separate physical file), but there are ways to
do so using either approach.  Personally, I am comfortable with NDATA
entities and notations, but I get the impression that people are
(informally) deprecating them.

All the best,


David Megginson                 ak117 at
Microstar Software Ltd.         dmeggins at

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