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Re: More semantic comments (XML Schema value spaces)

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 13 Nov 2002 16:09:33 +0000
To: Dan Connolly <connolly@w3.org>
Cc: Pat Hayes <phayes@ai.uwf.edu>, Jeremy Carroll <jjc@hplb.hpl.hp.com>, w3c-rdfcore-wg@w3.org
Message-ID: <f5bvg31xxhe.fsf@erasmus.inf.ed.ac.uk>

As Pat and I have gone through, there are two separate issues here:

1) Value spaces -- they're sets alright, as you would hope and expect,
and their members are simple things _in the world_ such as numbers,
strings, booleans, URIs.

2) The definition of certain aspects of schema-validity which appear
to appeal to values should actually be understood as appealing to
pairs of values and the type they are a member of.  Thus the REC says
that (double)3 does not compare equal to (float)3, and
(string)my:aname does not compare equal to (anyURI)my:aname.

(2) is _only_ relevant to W3C XML Schema internal processes, and
shouldn't get in the way of RDF using the types and their value
spaces, in my opinion.

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2002, 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/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]
Received on Wednesday, 13 November 2002 11:10:12 UTC

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