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From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Tue, 12 May 2009 14:09:02 +0100
Message-ID: <D72AF46149B1D74FBC8CD7090ED2446BF963FE@EMAIL.ordsvy.gov.uk>
To: "Tim Berners-Lee" <timbl@w3.org>
Cc: "Steve Harris" <steve.harris@garlik.com>, <public-lod@w3.org>, <semantic-web@w3.org>

> I agree adding more OWN by degrees is a good idea.
> But what, John, would you mean by "mandate".
> Do you mean "When  I have said something about a class in OWL 
> I'm happy for your to hold me to it", or "When  I have said 
> something about a class in OWL, anyone calling themselves a 
> Link Data client would be required to make the inferences from it."?

I guess the former really. I don't think I'd require people to make any
inferences from it...more this is what I mean by this class. I don't
think I'd require them to make inferences. In fact in a way I'd quite
like to be able to say something reasonably complex in OWL, but then
have (say) and RDFS client ignore the OWLish parts.
> When you go down the latter path people run screaming.
> There is some movement toward defining a category of agent 
> which does certain things such as RDFS, IFP, FP, sameAs (like 
> Tabulator) and adding some more limited OWL as you describe, 
> possibly having more than one

As a LOD community would it be useful to decide on one of the OWL 2
dialects as some kind of LOD standard for OWL? Might help tool/agent
developers develop tool to do inference over either OWL2RL or OWL2QL
that are both intended for large amount of data. 

> - Does anyone have an SPARQL server software which stores a 
> set of triples and queries automatically the (virtual) OWL-x 
> closure of them?  (Ora's Wilbur engine did this with RDFS)
> - If that functionality is done in a federated SPARQL system, 
> do we just expect inference within each server, or can one 
> form some form cross-linking allowing a OWL-aware query of 
> two large separate datasets?

That's an interesting problem...


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Received on Tuesday, 12 May 2009 13:09:44 UTC

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