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Re: Cutting the Patrician datatype knot

From: Jonathan Borden <jborden@mediaone.net>
Date: Sat, 22 Dec 2001 11:49:15 -0500
Message-ID: <005b01c18b08$a670e3e0$0301a8c0@ne.mediaone.net>
To: <Patrick.Stickler@nokia.com>, <pfps@research.bell-labs.com>, <phayes@ai.uwf.edu>
Cc: <www-rdf-interest@w3.org>, <joint-committee@daml.org>
Patrick,

Let me say this as plainly as possible:

XML Schema 1.0 does not provide a general mechanism to assign URIs to
datatypes.

XML Schema 1.0 identifies datatypes by XML QNames, not URIs.

That said, the XML Schema 1.0 recommendation (part 2) explicitly provides a
specific set of URIs for a specific set of primitive datatypes.

Jonathan



> > d) there are (currently) _serious_ problems assigning URIs to
> > general XML
> > Schema datatypes. The URIs given for the simple XML Schema
> > datatypes have
> > been explicitly created. The XML Schema formalism (WD)
> > proposes a new URI
> > syntax to resolve these issues, but this syntax is not
> > comparible with other
> > XML fragment identifier syntax proposals including XPointer. Sigh.
>
> While this is a significant issue to be resolved within the
> broader scope of XML/Web standards interoperability, it does not
> pose a problem to RDF, per se, so long as datatype URIs are
> valid URIs -- since URIs are opaque identifiers within the
> RDF graph space.
>
> Thus, following the approach of pairing lexical form (literal)
> with data type (URI), RDF should be able to handle any data
> typing scheme so long as each data type (simple or complex) has
> a valid URI -- regardless of whether that URI is parsable or
> meaningful to any other particular XML or internet standard
> or tool.
>
> Cheers,
>
> Patrick
>
> --
>
> Patrick Stickler              Phone: +358 50 483 9453
> Senior Research Scientist     Fax:   +358 7180 35409
> Nokia Research Center         Email: patrick.stickler@nokia.com
Received on Sunday, 23 December 2001 07:13:31 GMT

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