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Re: Chair's Concerns re: Test Cases and CR

From: Ian Horrocks <horrocks@cs.man.ac.uk>
Date: Mon, 29 Sep 2003 16:53:19 +0100 (BST)
To: Frank van Harmelen <Frank.van.Harmelen@cs.vu.nl>
Cc: webont <www-webont-wg@w3.org>
Message-ID: <Pine.LNX.4.44.0309291651571.11882-100000@galahad.cs.man.ac.uk>

On September 29, Frank van Harmelen writes:
> 
> 
> 
> Ian Horrocks wrote:
> 
> > the extensive use of oneOf in the wine and food
> > ontologies is largely gratuitous (it seems to be mainly the result of
> > their origin in a language that supported this constructor but did not
> > support unions of classes), and is setting a bad example to
> > prospective users - it encourages the use of statements that are, in
> > most cases, stronger than is needed/intended, and that are known to be
> > difficult to reason with.
> >
> > One further point. Given the elimination of oneOf, then the wine and
> > food ontologies could even be transformed into OWL Lite, although this
> > would result in some mangling of the syntax (in order to capture
> > negation and disjunction).
> 
> Jeremy Carroll wrote:
> 
> > I have code for that if needed.
> 
> I think all these points:
> 
> 1) be careful with oneOf's
> 2) without oneOf's, an ontology can often be transformed from DL into  Lite
> 3) that step can even be done automatically
> 
> are all very good points to make in whatever "style/how-to" guide we  will be 
> writing.

Agreed, but w.r.t. point 1, our advice would carry more weight if we
were seen to be taking it seriously in our own example ontologies!

Ian



> 
> Frank.
>    ----
> 


-- 
Ian Horrocks, Department of Computer Science,
University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Tel: +44 161 275 6133/6248  Fax: +44 161 275 6211
Email: horrocks@cs.man.ac.uk
URL: http://www.cs.man.ac.uk/~horrocks
Received on Monday, 29 September 2003 11:51:46 GMT

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