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RE: suggest owl11:chain to relate a list of properties to their chain/composition

From: Turner, David <davidt@hp.com>
Date: Wed, 1 Aug 2007 08:26:09 +0100
Message-ID: <86FE9B2B91ADD04095335314BE6906E8D6D547@sdcexc04.emea.cpqcorp.net>
To: "Dan Connolly" <connolly@w3.org>, "Jeremy Carroll" <jjc@hpl.hp.com>
Cc: "Owl Dev" <public-owl-dev@w3.org>

The following is motivated by thoughts towards a RDF-compatible
semantics for OWL-1.1.

> -----Original Message-----
> From: public-owl-dev-request@w3.org 
> [mailto:public-owl-dev-request@w3.org] On Behalf Of Dan Connolly
> Sent: 31 July 2007 23:41
> To: Jeremy Carroll
> Cc: Owl Dev
> Subject: Re: suggest owl11:chain to relate a list of 
> properties to their chain/composition
> 
> 
> On Tue, 2007-07-31 at 23:22 +0100, Jeremy Carroll wrote:
> > Making the bnode explicit:
> > 
> > _:p rdfs:subPropertyOf uncle.
> > _:p = (parent brother).
> > 
> > There exist a thing (_:p) that is a subPropertyOf uncle 
> (and hence it 
> > is a property), which equals parent composed with brother.

No, that just says that equals the list [parent, brother], not their
composition, unless you make that a part of the RDF-style semantics. I'd
agree that a relation, owl11:chain, that relates lists of properties to
their compositions is a reasonable suggestion, more so than simply
saying that the property-extension of a list is the composition of the
property-extensions of the list elements.

> > 
> > Doesn't that read OK?
> 
> Well, no. I can't put my finger on any sharp mathematical 
> reasons why not, but it doesn't.

Another valid reason would be backwards-compatibility. From section 5.4
of the OWL-1.0 semantics, IOOP and IL are disjoint in OWL DL
interpretations. So you can't have something is an owl:ObjectProperty
and an rdf:List in OWL-1.0 DL and I agree that it jars to do so in
OWL-1.1.

> It certainly doesn't follow the pattern of
> 
>  Man owl:intersectionOf (Person Male).
>  Adult owl:unionOf (Man Woman).

+1

Cheers,

Dave


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Received on Wednesday, 1 August 2007 07:26:39 UTC

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