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RE: Issue: pfps-13 Datatype Facets [was: RE: What is an RDF datatype?

From: <Patrick.Stickler@nokia.com>
Date: Fri, 31 Jan 2003 17:03:45 +0200
Message-ID: <A03E60B17132A84F9B4BB5EEDE57957B01B90AA1@trebe006.europe.nokia.com>
To: <bwm@hplb.hpl.hp.com>, <jjc@hplb.hpl.hp.com>, <www-rdf-comments@w3.org>



> -----Original Message-----
> From: ext Brian McBride [mailto:bwm@hplb.hpl.hp.com]
> Sent: 31 January, 2003 16:39
> To: Jeremy Carroll; www-rdf-comments@w3.org
> Subject: Issue: pfps-13 Datatype Facets [was: RE: What is an RDF
> datatype?
> 
> 
> 
> Recorded as:
> 
>    http://www.w3.org/2001/sw/RDFCore/20030123-issues/#pfps-13
> 
> Brian
> 
> At 13:59 31/01/2003 +0100, Jeremy Carroll wrote:
> 
> >Peter:
> > > So what happened to the XML Schema datatype facets?  Are they
> > > part of RDF datatypes?
> >
> >Patrick:
> > > Facets are not part of RDF Datatypes. I made 
> recommendations to the
> > > editors earlier to adjust the wording
> >
> >IMO, basically Patrick is right here.
> >I suggest we assign an issue against RDF Concepts on this 
> one. The other
> >documents may need checking. It is IMO 'editorial'.
> >
> >However, we need to be careful to not suggest that xsd:int 
> for example does
> >not have facets. It does; it is simply that they do not play 
> a visible role
> >in RDF's use of the datatype.
> >
> >They do interact with the crucial lexical-to-value mapping, 
> so they are
> >relevant to implementors of xml schema datatypes, and also to how RDF
> >semantics works. Crucially, if we have a derived XML Schema 
> datatype then
> >certain semantics properties, of RDF documents using such a 
> datatype, hold
> >depending on the value of the facets.
> >
> >Jeremy

Technically, I agree with what Jeremy has summarized above, though
we need to be cautious about saying that facets "interact" with
the L2V mapping. They do, insofar as they are (XML Schema specific)
mechanisms for defining the datatype and thus in a way the definition
of its L2V mapping, and thus *indirectly* have relevance to RDF
semantics, but they don't *directly* "interact" in any way with
RDF semantics and have no direct visibility or definition insofar
as RDF semantics are concerned. They remain completely outside
the scope of RDF semantics -- and are relevant only to applications
which implement support for XML Schema datatypes in terms of 
the machinery provided by XML Schema. RDF doesn't care about facets.

Cheers,

Patrick
Received on Friday, 31 January 2003 10:03:49 GMT

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