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RE: Question about S

From: Graham Klyne <Graham.Klyne@MIMEsweeper.com>
Date: Thu, 03 Jan 2002 11:45:26 +0000
Message-Id: <5.1.0.14.2.20020103114009.00a071e0@joy.songbird.com>
To: Patrick.Stickler@nokia.com
Cc: w3c-rdfcore-wg@w3.org
At 03:21 AM 12/17/01 +0200, Patrick.Stickler@nokia.com wrote:
> > >Here is the question again with examples:
> > >
> > >The S examples include statements such as the following:
> > >
> > >    Bob ex:age _:1 .
> > >    _:1 s:integer "10" .
> > >    s:integer rdfs:domain xsd:integer .
> > >
> > >I understand this to mean that the node '_:1' denotes a value
> > >of type xsd:integer and there is a mapping to that value from
> > >the lexical form "10" which is presumed to be a member of the
> > >lexical space of xsd:integer.
> >
> > The statements above, as given, don't express the idea that "10" is a
> > member of the lexical
> > domain of xsd:integer.  Hence...
>
>Then can you provide an alternate example that does? I'm
>presuming that somehow, somewhere, we need to know that "10"
>is a member of the lexical space of xsd:integer. How is that
>defined in S if not as above?

Well, this might (for some appropriate definition of lex:integer):

     Bob ex:age _:1 .
     _:1 s:integer "10" .
     s:integer rdfs:range lex:integer .

[...]
> > The "special treatment" of datatypes is that the
> > datatype-defining URIs
> > have fixed interpretations. In the your example, having the
> > definition of
> > s:integer fixed so that its relational extension contains
> > pairs of the form:
> >
> >      <1,"1">
> >      <2,"2">
> >      etc.
>
>And then how do you declare a given URI as a datatype-defining
>URI?

Well, I don't know what you mean by "datatype-defining", but some means 
external to the RDF core would be used to define that the class associated 
with a URI has some specified class extension.  RDF itself has no way to 
define the actual meaning of any given URI, just rules which allow 
preservation of meaning to be determined.

#g



------------------------------------------------------------
Graham Klyne                    MIMEsweeper Group
Strategic Research              <http://www.mimesweeper.com>
<Graham.Klyne@MIMEsweeper.com>
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Received on Thursday, 3 January 2002 08:18:34 EST

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