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Re: Proposed response to Martin Merry, HP

From: Ian Horrocks <horrocks@cs.man.ac.uk>
Date: Wed, 14 May 2003 19:48:51 +0100
Message-ID: <16066.36755.591494.435468@excalibur.oaklands.net>
To: Jeremy Carroll <jjc@hpl.hp.com>
Cc: www-webont-wg@w3.org

On May 14, Jeremy Carroll writes:
> 
> In 
> http://lists.w3.org/Archives/Public/www-webont-wg/2003May/0181.html
> 
> DanC:
> > On closer examination of the comment, it seems
> > to be more about what goes in OWL DL than
> > what goes in OWL Lite.
> 
> And in ...
> http://lists.w3.org/Archives/Public/www-webont-wg/2003May/0174.html
> DanC:
> >Please help me find the relevant decisions
> >and/or find evidence that those implementations
> >pass some relevant tests and/or add an
> >issue to the issues list.
> 
> In January, we agreed a definition of a "complete OWL DL consistency checker", 
> if we had evidence that such a thing existed, and/or that more than one would 
> exist in the future (and the WG was satisfied that they would be practically 
> usable, rather than essentially theoretical exercises) then we could respond 
> with a message that indicated that, and that we thought that that was 
> sufficient to justify the DL level.

We could build an reasoner based on algorithms for C2, but as I
pointed out in earlier email, performance would probably be poor for
larger problems. Many people are working on the problem of developing
more practical algorithms for logics with oneOf - and the existence of
OWL DL would no doubt provide a spur to such efforts. It is, however,
widely recognised to be a very hard problem, and no guarantees can be
made about the outcome/timescale.

Ian

> 
> If we don't have such evidence then I agree with 
> http://lists.w3.org/Archives/Public/www-webont-wg/2003May/0181.html
> 
> DanC:
> > Mr. Merry's point, "We're concerned that OWL users should have their
> > expectations met when they use OWL compliant systems." seems well
> > made, no?
> 
> (A danger is that if OWL DL is tainted then the whole OWL brand is tainted).
> 
> Jeremy
> 
> 
> 
> 
> 
> 
Received on Wednesday, 14 May 2003 16:15:22 GMT

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