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Re: OWL Lite or DL?

From: Adrian Walker <adrianw@snet.net>
Date: Tue, 22 Aug 2006 18:28:02 -0400
Message-Id: <5.0.2.1.2.20060822181520.0358a450@pop.snet.net>
To: Chimezie Ogbuji <ogbujic@bio.ri.ccf.org>
Cc: Hunter@uchsc.edu, jbarkley@nist.gov, public-semweb-lifesci@w3.org

Hi Chimezie --

Thanks for your most helpful posting.

At 01:00 PM 8/22/2006 -0400, you wrote:

>Actually, I believe by virtue of being of the SHOIN family of Description 
>Logics [1] that OWL-DL & RDFS can express this [transitive over] through 
>role hierachies and transitive roles

So, does it remain true that OWL by itself, without the help of RDFS, 
cannot express "transitive over" ?


>(both of which are part of [2] SHOIN: S - Role transitivity, H - Role 
>hierarchy)
>
>[1] http://www.cs.man.ac.uk/~horrocks/Publications/download/2003/HoPH03a.pdf
>[2] http://www.cs.man.ac.uk/~ezolin/logic/complexity.html
>
>I.e., instead of
>
>:worksFor :transitiveOver :consistsOf.
>
>you would have
>
>:consistsOf rdf:type owl:TransitiveProperty
>:worksFor rdfs:subPropertyOf :consistsOf
>
>Which would result in the same conclusions via a reasoner


I'd like to try this in practice.  Can you suggest some reasoners?

>following the axiomatic semantics of owl:TransitiveProperty and 
>rdfs:subPropertyOf (in N3):
>
>{?P a owl:TransitiveProperty. ?X ?P ?O. ?S ?P ?X} => {?S ?P ?O}.
>{?P rdfs:subPropertyOf ?R. ?S ?P ?O} => {?S ?R ?O}.

I hope to see this working.  But even if it does, I'm concerned that 
extending this kind of notation beyond toy problems is going to result in 
reasoning that is very hard to check. To put it another way, the logic is 
very powerful, and the notation is somewhat opaque, so that a small slip in 
writing is easy to make and could have vast erroneous consequences -- 
particularly if deployed over the world wide web.

Hope I'm wrong about this.  What do you think?

                                 Cheers,   -- Adrian



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Received on Tuesday, 22 August 2006 22:28:36 GMT

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