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Re: XML Schema working with DTDs?

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 29 Apr 2000 10:13:24 +0100
To: Dan Connolly <connolly@w3.org>
Cc: Noah_Mendelsohn@lotus.com, cmsmcq@acm.org, reagle@w3.org, www-xml-schema-comments@w3.org
Message-ID: <f5b66t16zij.fsf@cogsci.ed.ac.uk>
I'll make three observations:

1) In the nicest possible way, I'm not sure what we owe to Joseph on
this one.  We have _not_ published this namespace yet, in the sense of
asserting publicly in a process-blessed way that
http://www.w3.org/1999/XMLSchema is the namespace URI for a namespace
whose semantics are defined in some officially approved REC.

2) The thrust of Dan's remarks are at odds with my memory of the
discussions surrounding the decision to enforce
http://www.w3.org/1999/XSL/Transform as the namespace URI for XSLT,
which strongly suggested a philosophical stance about persistent
identity clearly at odds with the practical reality of changing
details.  In particular the decision to _not_ add a version number to
that NS URI was taken after considerable thought.

I'm afraid this takes us back to my concern about too-tight connection 
between namespace URI and presumed resource (= XML Schema in this
case) location.

3) There's certainly precedent for 'stable' resources evolving:  the
XML Spec DTD still lives at http://www.w3.org/XML/1998/06/ although
it's currently in its 21st edition.

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Saturday, 29 April 2000 05:13:37 UTC

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