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Re: Characterising OWL consistency checkers

From: Ian Horrocks <horrocks@cs.man.ac.uk>
Date: Sat, 8 Mar 2003 19:11:58 +0000
Message-ID: <15978.16510.744451.749062@merlin.horrocks.net>
To: Jim Hendler <hendler@cs.umd.edu>
Cc: www-webont-wg@w3.org

On March 7, Jim Hendler writes:
> 
> At 18:02 +0000 3/7/03, Ian Horrocks wrote:
> >On March 7, Jim Hendler writes:
> 
> >[snip
> 
> 
> >Because ALL datatypes/values are interpreted, an OWL reasoner MUST
> >"deal with" all datatypes. This isn't a big overhead because
> >unsupported datatypes can be treated in a uniform and very lightweight
> >manner. If a reasoner claims to support a given datatype, AND it
> >claims to be complete, then it has to do more work w.r.t. that
> >datatype (the MT formalises just what it has to do).
> 
> yes, but remember that many of our readers won't know this, and thus 
> I just want to make sure someone says it in novice-understandable 
> form in our document.  I did very much like what you wrote, wasn't 
> being critical

OK - fair enough. I can try to come up with a few more words.

> 
> >
> >>    but we need some decision on this
> >
> >The decision as to which datatypes (if any) MUST be supported by all
> >OWL reasoners is obviously one that has to be made by the working
> >group. My suggestion is that we make this a fairly short (possibly
> >zero length) list.
> 
> actually, I think your ACTION item was to take a first stab at making 
> a suggestion.  If you want to suggest zero length, that woudl address 
> your action.  I probably prefer string and integer, but could live 
> with none.

Agreed. Wording could be:

  An OWL consistency checker MUST support at least the following XMLS
  datatypes: integer, string.

There is an issue as to whether we want to include all the sub-types
if integer in this list, e.g., int and byte. There is also the
question of whether we want to add anything about additional datatypes
that OWL "should" support? E.g.:

  An OWL consistency checker SHOULD also support the following XMLS
  datatypes: ...

Ian


> 
> Guus, can you make sure this goes on WG agenda to get resolved on 13th?
>   cheers
>   JH
> 
> -- 
> Professor James Hendler				  hendler@cs.umd.edu
> Director, Semantic Web and Agent Technologies	  301-405-2696
> Maryland Information and Network Dynamics Lab.	  301-405-6707 (Fax)
> Univ of Maryland, College Park, MD 20742	  240-731-3822 (Cell)
> http://www.cs.umd.edu/users/hendler
Received on Saturday, 8 March 2003 13:11:11 GMT

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