Re: A DTD for the abstract RDF model

From: Pierre-Antoine CHAMPIN <champin@bat710.univ-lyon1.fr> · Date: Mon, 09 Oct 2000 16:45:15 +0200

I guess we could get rid of any llteral by writing :

<Description>
  <value resource="data:98">
  <type resource="http://www.datatypes.org/useful_types#Integer"/>
</Description>

Jonas Liljegren wrote:
> 
> Graham Klyne <GK@Dial.pipex.com> writes:
> 
> > I think I can accept the broad thrust, but maybe have problems with
> > a few details.
> >
> > If I understand correctly, you replace a literal with a resource
> > with properties, as in:
> >
> >    <Description>
> >      <value>98</value>
> >      <type resource="http://www.datatypes.org/useful_types#Integer"/>
> >    </Description>
> >
> > so that the 'value' attribute has the literal value as an object, the 'type'
> > indicates a subtype of literal.  Attributes of the property referencing the
> > literal, such as xml:lang, can be represented as properties on the literal
> > resource.
> 
> Yes.  And this is based on the RDF M&S and RDF Schema.  The M&S have a
> section talking about the value property, used to specify the unit for
> a value, and other things.  The RDF Schema defines the Literal class.
> 
> > Given the above, what (if anything) is to prevent:
> >
> >    <Description>
> >      <value>
> >        <Description>
> >          <value>98</value>
> >          <type resource="http://www.datatypes.org/useful_types#Integer"/>
> >        </Description>
> >      </value>
> >      <type resource="http://www.datatypes.org/useful_types#Integer"/>
> >    </Description>
> >
> > ?  i.e. repeated substitution of the literal with its interpretation as a
> > resource.  Does this matter?  Maybe not.
> 
> Exactly. But that should only be a syntax thing.  We can now simply
> remove the literal from the DLG. ... But the thing here is that that's
> optional.  Everything will work the same way either way.
> 
> > When you wrote:
> >
> > >Age as a resource:
> > >
> > ><Description about="http://give.me/a.number">
> > >     <type resource="http://www.datatypes.org/useful_types#Integer"/>
> > ></Description>
> >
> >
> > I'm not sure how you mean the value "98" to be conveyed.
> 
> The number will be conveyd by the implementing software, outside the
> realm of RDF.  Either by accessing some database or internal
> representation to get the value associated with the resource.  Or maby
> by accessing the page http://give.me/a.number and displaying the
> retrieved result.
> 
> The method of accessing the actual value will be dependent on the
> implementing software.  Let's say that the resouce
> http://give.me/mp3.file represents a mp3 music file.  We could say
> that the URI http://give.me/mp3.file#title will represent the title of
> the track, stored inside it.  A mp3-aware RDF program could retrieve
> the actual title by parsing the mp3 file.
> 
> For more about all sorts of RDF things. Check out the mail archive for
> the Wraf project:
>         http://www.uxn.nu/wraf/
>         http://www.uxn.nu/cgi-bin/mailman/listinfo/rdf
> 
> --
> / Jonas  -  http://jonas.liljegren.org/myself/en/index.html

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