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Re: Restricting substitution groups?

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 14 Feb 2002 11:31:29 +0000
To: Eric van der Vlist <vdv@dyomedea.com>
Cc: xmlschema-dev@w3.org, www-xml-schema-comments@w3.org
Message-ID: <f5bheokmh9q.fsf@cogsci.ed.ac.uk>
Eric van der Vlist <vdv@dyomedea.com> writes:

> As mentioned by Jeni and Noah in their answers, it would be nice to
> get a definitive answer and you are probably the only one who can give
> it :) !
> 
> 
> Untill we get such an answer, my position is that since the result of
> this restriction relies on something (the order of elements in a
> substitution group) which is undefined, restriction of substitution
> groups are themselves undefined and should be avoided as source of
> potential interroperability issues.

<snip/>

> >>Does that mean that we can restrict substitution groups?

Yes.

The REC is underspecified in the area of the order of the implicit
choice represented by a substitution group head.  I think an erratum
is in order, as Martin Gudgin suggested, clarifying that in this case
the order constraint doesn't apply.

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 Thursday, 14 February 2002 06:40:01 GMT

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