- From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
- Date: 31 Oct 2002 16:59:44 +0000
- To: Brian McBride <bwm@hplb.hpl.hp.com>
- Cc: www-xml-schema-comments@w3.org, Patrick Stickler <patrick.stickler@nokia.com>, Graham Klyne <GK@NineByNine.org>
Brian McBride <bwm@hplb.hpl.hp.com> writes:
> The RDFCore WG are putting the finishing touches to a proposal for
> using XML Schema Datatypes in RDF graphs. We hope to have a WD to
> share with folks soon.
Great.
> In doing this, the following question has arisen concerning the value
> spaces of the primitive datatypes.
>
>
> Are the value spaces of the primitive datatypes disjoint, i.e. are
> there any cases where a value may be in more than value space.
Not in the XML Schema REC as published.
> A specific case to consider is:
>
> is http://example.org/ in both xsd:string and xsd:anyURI
>
Disjoint.
> noting that RFC 2396 states:
>
> [[An identifier is an object that can act as a reference to
> something that has identity. In the case of URI, the object is
> a sequence of characters with a restricted syntax.]]
>
> Put another way, can we assume that if we have two values, one from
> the value space of one primitive datatype, and the other from the
> value space of a different primitive datatype, then they must be
> different values.
Yes.
> To the best of my knowledge, the RDFCore WG has no preferred answer to
> this question. We wish to know the answer to ensure that our
> specification accurately reflects XML Schema datatypes.
We are in fact preparing an erratum to clarify this, as the current
wording is somewhat unclear, and in one respect wrong.
ht
--
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 Thursday, 31 October 2002 11:59:54 UTC