- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 22 Jan 2001 09:50:42 +0000
- To: James Clark <jjc@jclark.com>
- Cc: XML Schema Comments <www-xml-schema-comments@w3.org>
James Clark <jjc@jclark.com> writes:
> What happens if fields in identity constraints evaluate to values of
> different types for different target node-sets? This would require be to
> compare values of different types. Is this an error, always false,
> false only if they do not have a common super type or what?
Should be clarified. I _think_ (need confirmation from the Datatypes
editors) that values from distinct value spaces always compare not
equal, but that a derived type's values _are_ in the same value space as
its base type, so e.g.
3 [integer] = 3 [short]
and "foo" [string] = "foo" [token]
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, 22 January 2001 04:50:44 UTC