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Re: [OEP] n-ary relations and topic maps

From: Alan Rector <rector@cs.man.ac.uk>
Date: Thu, 09 Dec 2004 18:01:47 +0000
Message-ID: <41B8930B.571CEB6@cs.man.ac.uk>
To: Lars Marius Garshol <larsga@ontopia.net>
CC: public-swbp-wg@w3.org

I think this issue is more general than Topic Maps.  In both OWL and RDF, the
question is whether there should be a set of annotations to indicate that a
particular set of constructs is actually part of a larger pattern.  The n-ary
relation case is most obvious because other representations support n-ary
relations natively.  Users consistently ask to see ontologies at a higher level
of abstraction.  That's part of what patterns were about.  To achieve this, we
need annotations to indicate the patterns.

Would a sensible procedure be to seek to establish a namespace suggestion for
such annotation properties?  Is there any mechanism for doing so?



Lars Marius Garshol wrote:

> * Bernard Vatant
> |
> | For the record, the idea to add a note about TM to the n-ary
> | document arose before the TM Task Force was formed.
> |
> | I agree with Lars and Fabien.
> I'm glad to hear that.
> However, I think we now lost the point I *was* making. The n-ary
> document is presumably going to make recommendations about how to
> express n-ary relationships in RDF, and the RDFTM documents should
> note this and
>   1) explain how an RDF->TM converter can detect such relationships
>      and correctly convert them to n-ary topic map associations,
>   and
>   2) explain how a TM->RDF converter can represent n-ary topic map
>      association in RDF.
> It now seems like this is mostly something for the RDFTM TF to think
> about, but possibly with some consequences for the n-ary relations
> draft.
> --
> Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
> GSM: +47 98 21 55 50                  <URL: http://www.garshol.priv.no >

Alan L Rector
Professor of Medical Informatics
Department of Computer Science
University of Manchester
Manchester M13 9PL, UK
TEL: +44-161-275-6188/6149/7183
FAX: +44-161-275-6236/6204
Room: 2.88a, Kilburn Building
email: rector@cs.man.ac.uk
web: www.cs.man.ac.uk/mig
Received on Friday, 10 December 2004 11:13:16 UTC

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