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Re: owl:Thing in RL profile?

From: Alan Ruttenberg <alanruttenberg@gmail.com>
Date: Fri, 14 Aug 2009 01:32:11 -0400
Message-ID: <29af5e2d0908132232w67434e50r5cb268faf36339f9@mail.gmail.com>
To: Bijan Parsia <bparsia@cs.man.ac.uk>
Cc: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>, Boris Motik <boris.motik@comlab.ox.ac.uk>, W3C OWL Working Group <public-owl-wg@w3.org>
On Thu, Aug 13, 2009 at 5:05 PM, Bijan Parsia<bparsia@cs.man.ac.uk> wrote:
> On 13 Aug 2009, at 10:31, Ian Horrocks wrote:
>> I agree with what Boris says. There are several features that we excluded
>> from RL on the grounds that they would hamper practical implementation. I
>> believe that this was one of them. The argument goes that adding owl:Thing
>> to the profile would require a rule that adds the relevant type triple for
>> every individual. Of course there is nothing to prevent RL implementations
>> from dealing correctly with owl:Thing, but they are not required to do so in
>> order to be conformant.
> Plus, frankly, owl:Thing instantiation entailments (or assertions) are
> silly, given their tautologous nature.

They are silly in exactly the same way the
owl:Top(Data|Object)Property entailments are silly, no?

Received on Friday, 14 August 2009 05:33:10 UTC

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