XML Schemas to be allowed in SGML? Re: Musing over Namespaces

Rick Jelliffe ricko at allette.com.au
Tue Dec 21 06:51:10 GMT 1999

From: Arjun Ray <aray at q2.net>
 >> ISO has a correction to SGML in the wings to allow alternative
>> schema syntaxes to DTDs: I think it has been waiting for 2 years.
>Is there anything on this at the WG4 site?  (And/Or is this another
>implication of SEEALSO?)


The draft proposal is for "DTD Notations". The syntax proposed is:

 <!DOCTYPE xxx SYSTEM "xxx.xmlschema" 
        NDATA http://..xmlschemas >

I doubt ISO will move on this unless XML or some other SGML
community requires it, and I doubt that XML would require it. 
So I take it to mean that ISO JTC1/SC34 is happy to allow 
non-DTD schema languages providing they are well-defined 
(in the same way that SGML allows many DTDs,
many syntaxes, many encodings).

Rick Jelliffe

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