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Re: RIF Core shortened

From: Christian de Sainte Marie <csma@ilog.fr>
Date: Tue, 18 Nov 2008 18:55:45 +0100
Message-ID: <492301A1.9090401@ilog.fr>
To: Gary Hallmark <gary.hallmark@oracle.com>
CC: kifer@cs.sunysb.edu, Patrick Albert <palbert@ilog.fr>, Dave Reynolds <der@hplb.hpl.hp.com>, "Boley, Harold" <Harold.Boley@nrc-cnrc.gc.ca>, Adrian Paschke <Adrian.Paschke@gmx.de>, Axel Polleres <axel.polleres@deri.org>, RIF WG <public-rif-wg@w3.org>

Gary Hallmark wrote:

> I do not know what an "externally defined data model" is.

E.g. an XML Schema (I had your strawman on that subject [1] in mind).

[1] http://lists.w3.org/Archives/Public/public-rif-wg/2008Oct/0046.html

> I like the 
> SWC model, where one can import an RDF graph or OWL ontology.  But the 
> semantics is defined by mapping those imported things to the RIF data 
> model, i.e. herbrand terms and frames.  I think a similar approach works 
> for schema-valid XML.  But that may mean, depending on how one 
> interprets what an external data model is, that it is precisely the 
> facts of the form o#C where C is imported from an XML document (is this 
> an external data model?) that is needed.

Yes. I understand that. But the way the semantics is specified in PRD does not require that the XML schema be translated in PRD, not anymore than it is required that the WM be translated in PRD etc. Of course, it requires that the mapping be specified; but not that the facts be actually asserted in PRD (they are pre-existing in the externally defined data model, if you like).

My point is that being able to assert membership facts is not required for that reason.

Now, that does not mean that there are no, other, legitimate reasons to allow the assertion of such fact.

I detailled my analysis of what should be allowed and what not, but this is just my contribution to the discussion...

Cheers,

Christian
Received on Tuesday, 18 November 2008 18:00:09 GMT

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