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Re: Model-specific identity for anon resources, and its representation: A new issue?

From: Brian McBride <bwm@hplb.hpl.hp.com>
Date: Sun, 17 Jun 2001 10:52:54 +0100
Message-ID: <3B2C7DF6.75C0B444@hplb.hpl.hp.com>
To: w3c-rdfcore-wg@w3.org
Jan,

There is an issue:

  http://www.w3.org/2000/03/rdf-tracking/#rdfms-identity-anon-resources

Could we link the points you have raised in with that issue?

Brian

  

> Re: Model-specific identity for anon resources, and its representation: A new issue?
> 
> From: Jan Grant (Jan.Grant@bristol.ac.uk)
> Date: Thu, Jun 14 2001
> 
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> 
> Date: Thu, 14 Jun 2001 11:41:40 +0100 (BST)
> From: Jan Grant <Jan.Grant@bristol.ac.uk>
> To: "jos.deroo.jd" <jos.deroo.jd@belgium.agfa.com>
> cc: w3c-rdfcore-wg <w3c-rdfcore-wg@w3.org>
> Message-ID: <Pine.GSO.4.31.0106141136280.27373-100000@mail.ilrt.bris.ac.uk>
> Subject: Re: Model-specific identity for anon resources, and its                   representation: A  new issue?
> 
> On Thu, 14 Jun 2001 jos.deroo.jd@belgium.agfa.com wrote:
> 
> > We can imagine that anounymous terms are identified 'by their content'
> > e.g. see "more N-triples (Was RDF Statements as floating Cons Cells)"
> > http://lists.w3.org/Archives/Public/www-rdf-logic/2001Jun/0191.html
> > elaborating on that
> > [[[
> >   If an arc points to an anonymous term, then it
> >   is there 'by value' so to speak (not 'by reference').
> >   Of course one could point to constant terms
> >   and universally quantified terms used in those
> >   subgraphs, but they are 'leafs' or at the 'subgraph
> >   boundaries' so to speak.
> > ]]]
> 
> This is not my intuition on this. I'm thinking purely of a graph-based
> RDF model (for the nontechnical meaning of "model"). It has nodes; some
> of those are labelled with URIs, some are not. The latter are
> "anonymous resources". Two distinct anonymous nodes may be in
> equivalent relationships with other nodes in the graph; this does not
> make them graph-theoretically equal.
> 
> Summary: an anonymous node has its own "model-specific identity". Two
> anonymous nodes in an RDF graph may have "the same content" but still be
> distinct.
> 
> > Let's start with
> >   _:a1 <http://random.ioctl.org/#p1> _:a2 .
> >   _:a2 <http://random.ioctl.org/#p2> _:a1 .
> >
> > If you point to _:a1 via e.g.
> >   <http://random.ioctl.org/#s3> <http://random.ioctl.org/#p3> _:a1 .
> > you can see how Euler copes with such content
> 
> [much Euler output snipped]
> 
> > So I think both cases are representable in RDF, no?
> 
> Forgive me, but if that is the case (and without adding additional
> triples), could you show me what the serialised RDF for each case looks
> like?
> 
> jan (a bit slow on the uptake)
> 
> --
> jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/
> Tel +44(0)117 9287163 Fax +44 (0)117 9287112 RFC822 jan.grant@bris.ac.uk
> Semantic rules, OK?
> 
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> 
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Received on Sunday, 17 June 2001 05:54:35 EDT

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