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RE: Jena reasoner (was Re: [OWLWG-COMMENT] Re: Cardinality Restrictions and Punning)

From: Michael Schneider <schneid@fzi.de>
Date: Mon, 7 Jan 2008 17:24:18 +0100
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A05A620F@judith.fzi.de>
To: "Jeremy Carroll" <jjc@hpl.hp.com>
Cc: "Evren Sirin" <evren@clarkparsia.com>, "Owl Dev" <public-owl-dev@w3.org>, "Dave Reynolds" <der@hplb.hpl.hp.com>

Hi, Jeremy!

Indeed, the way you phrase it does more clearly (i.e. less prone to
misunderstandings) express how I meant it. :)


Jeremy Carroll wrote:

>Apologies for a minor aside
>(I feel an obligation to correct a possible misunderstanding of Jena 
>Michael Schneider wrote:
>> I recently found that the Jena-OWL reasoner is actually a restricted
>> OWL-Full reasoner, since it is an extension of the Jena-RDFS 
>>   <http://jena.sourceforge.net/inference/index.html#OWLcoverage>
>>   "Since RDFS is not a subset of the OWL/Lite or OWL/DL languages 
>>   the Jena implementation is an incomplete implementation of 
>> Drawback: It doesn't fully support every OWL feature. But 
>this has not to do
>> with being an OWL-Full reasoner, but instead, AFAIK, has to 
>do with the
>> specific rule based approach the family of Jena reasoners apply. 
>I think I would phrase the last sentence as
>While it is inevitable that an OWL-Full reasoner cannot generate every 
>OWL Full entailment and non-entailment, the family of Jena 
>reasoners are 
>also limited by the choice to use a rule based approach.
>i.e. there are theoretical limitations, and the Jena reasoner 
>is further 
>limited by practical considerations due to some fundamental design 
>choices (which I think were quite sensible and defensible, but don't 
>particularly wish to do so now)
>I suppose it depends what you mean by a 'feature' of OWL.

Dipl.-Inform. Michael Schneider
FZI Forschungszentrum Informatik Karlsruhe
Abtl. Information Process Engineering (IPE)
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Email: Michael.Schneider@fzi.de
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Received on Monday, 7 January 2008 16:24:41 UTC

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