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Re: Derivation by restriction in XML Schema

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 06 Mar 2000 23:09:15 +0000
To: "Arnold, Curt" <Curt.Arnold@hyprotech.com>
Cc: "'www-xml-schema-comments@w3.org'" <www-xml-schema-comments@w3.org>, "'xml-dev@xml.org'" <xml-dev@xml.org>
Message-ID: <f5bem9n4rxg.fsf@cogsci.ed.ac.uk>
"Arnold, Curt" <Curt.Arnold@hyprotech.com> writes:

> The current formulation of derivation by restriction
> appears to have a couple of shortcomings:

1) Renaming is not supported -- communication failure between the
editors, my apologies.

2) The WG considered an XPath-based solution very similar to what you
propose and rejected it as too complex.

3) The relevant sections of Chapters 4 and 6 are _way_ short of
complete -- I'm very sorry this was not better indicated.  I'll post
a summary of the new material going in there tomorrow, I hope.

4) You can't restrict material from another namespace, whether it's
attribute or element, unless you own, or bogusly claim to own, rights
to define elements, attributes, types in that namespace, which, in the 
case of the XML namespace, you don't.

ht
-- 
  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 Monday, 6 March 2000 18:09:43 GMT

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