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effectively optional self-reference in group redefinition

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 16 Nov 2001 10:23:07 +0000
To: www-xml-schema-comments@w3.org
Message-ID: <f5bg07fovzo.fsf@cogsci.ed.ac.uk>
The definition of group redefinition attempts to require variants of
extension and restriction.  The extension variant falls between two
stools -- it allows pre-extension, and doesn't actually require
extension at all, since the self-reference can be wrapped inside a
<choice> or optional <sequence>.  We should do more or less -- I
favour less, i.e. make it _just_ like extension for types.

  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 Friday, 16 November 2001 05:22:08 UTC

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