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Is the reification of a resource unique.

From: McBride, Brian <bwm@hplb.hpl.hp.com>
Date: Fri, 15 Sep 2000 11:34:47 +0100
Message-ID: <5E13A1874524D411A876006008CD059F2393D2@0-mail-1.hpl.hp.com>
To: "'Jan Grant'" <Jan.Grant@bristol.ac.uk>, Graham Klyne <GK@Dial.pipex.com>
Cc: "'RDF Interest (E-mail)'" <www-rdf-interest@w3.org>
Hi Jan,

Sorry, I've been a bit slow catching on to the concern.

So the issue is:  Is there a unique resource which
represents a reified statement, or are there many.

Is that it?

I don't have a clear argument one way or the other
at the moment.  Do you have a reason for preferring
many?

Brian


> -----Original Message-----
> From: Jan Grant [mailto:Jan.Grant@bristol.ac.uk]
> Sent: 15 September 2000 09:30
> To: Graham Klyne
> Cc: McBride, Brian; 'RDF Interest (E-mail)'
> Subject: RE: abstract model
> 
> 
> On Thu, 14 Sep 2000, Graham Klyne wrote:
> 
> > Consider, if you have an RDF model (per M&S section 5 
> formal model) containing:
> > 
> >    [A] --type------> [Statement]
> >    [A] --subject---> [S]
> >    [A] --property--> [P]
> >    [A] --object----> [O]
> > 
> >    [B] --type------> [Statement]
> >    [B] --subject---> [S]
> >    [B] --property--> [P]
> >    [B] --object----> [O]
> > 
> >    [S] --P---------> [O]
> > 
> > There is no way to know if [A] or [B] is the reification of 
> "[S] --P--> [O]".
> 
> This is the problem I have, thus why I proposed the "is a reification
> of" relationship over the notion of a direct mapping.
> 
> The paper at
> http://nestroy.wi-inf.uni-essen.de/rdf/logical_interpretation/
index.html
seems to imply this interpretation too; the Reification mapping is not
single-valued.

jan

PS. What are the engineering implications of the Reification mapping
that Brian proposes?
- does a statement's reification have a URI? (or more than one, since a
reification is a resource which may have multiple URIs that symbolise
it)*
- in which case is there a way of determining that URI for any
particular reification?
- given a URI (or just a resource) is there a way of determining which
statement, if any, it reifies?

PPS. I've no problem with Brian's intuition about "Jan made a statement
about Dan, but I'm not exactly sure what" - it's a nice idea, but I
don't think it justifies a "the reification" viewpoint.

* Can of worms stuff apparently.

-- 
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
Bolstered by my success with vi, I proceeded to learn C with 'learn c'.
Received on Friday, 15 September 2000 06:34:52 GMT

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