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Re: ACTION-178: What is ISSUE-116 (Axiomatic Triples for OWL R) about?

From: Alan Ruttenberg <alanruttenberg@gmail.com>
Date: Tue, 12 Aug 2008 11:08:33 -0400
Message-Id: <2B0C2B68-ABEB-4083-ACCF-C95538DBC375@gmail.com>
Cc: "public-owl-wg Group WG" <public-owl-wg@w3.org>, "Ivan Herman" <ivan@w3.org>, "Zhe Wu" <alan.wu@oracle.com>, "Ian Horrocks" <ian.horrocks@comlab.ox.ac.uk>
To: "Michael Schneider" <schneid@fzi.de>


On Aug 12, 2008, at 11:02 AM, Michael Schneider wrote:

> Alan Ruttenberg wrote:
>
>> Is the assumption that in OWL R/Full that the only way in which one
>> determine entailments is to forward chain rules and then look in the
>> resultant triples for it?
>
> It's not an "execution semantics". Instead, there has to *exist* a  
> finite
> sequence of rule applications, which leads from the LHS to the RHS  
> (or an
> upper graph of the RHS).

OK. I'm then confused by Ian's comment about generating infinite  
numbers of triples:

> Presumably, making axiomatic triples be part of OWL RL (Full) would  
> mean extending the rule set so that it would generate such triples.  
> There could be a very large (perhaps even infinite) number of such  
> triples. This might be a serious burden on implementations and lead  
> to a significant degradation in performance.



> "Entailment" might be not the right term here, because it is  
> probably more
> typically used in the context of model-theoretic semantics. I  
> prefer to speak about "derivations".

We need to figure out and use a common language or make the  
appropriate language visible in the specification  if it is missing.

-Alan

>
>> -Alan
>
> Cheers,
> Michael
>
> --
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Received on Tuesday, 12 August 2008 15:09:14 GMT

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