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Re: LC comment: sameAs in OWL QL

From: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>
Date: Mon, 9 Feb 2009 12:36:48 +0000
Message-Id: <958C9093-C3BA-4ECC-A839-40AFA9AFE5EF@comlab.ox.ac.uk>
Cc: W3C OWL Working Group <public-owl-wg@w3.org>
To: Mike Smith <msmith@clarkparsia.com>

As Mike says, we already had an *extensive* discussion about this  
before deciding on the current solution. I don't see that the LC  
comment adds any new information, so why would be reopen the issue?


On 4 Feb 2009, at 15:16, Mike Smith wrote:

> On Tue, Feb 3, 2009 at 05:40, Ivan Herman <ivan@w3.org> wrote:
>> In the current version of OWL QL, owl:sameAs (if you prefer, same
>> individual assertion:-) is disallowed. Having checked with Boris (and
>> also chatted with Bijan) it seems that the reason is that this  
>> leaves it
>> open to possibly extend QL *either* to include owl:sameAs *or*
>> (exclusive 'or') functional properties.
>> In my view, it would be better to include one or the other to the
>> document to make the QL standard profile clearer and cleaner for  
>> users.
>> Introducing a loophole of extra extension would reduce the  
>> usability of
>> QL in my view, mainly in terms of interoperability.
>> The LOD movement, for better or worse, has already made an  
>> extensive use
>> of owl:sameAs in linking billions of triples stemming from public
>> databases. In view of that use case, my proposal is to _add_ the same
>> individual assertion into OWL QL. That would make OWL QL way more
>> attractive for an important user community.
> This was one side of the discussion in [ISSUE-133].  I believe that
> the email discussion linked to that issue (including the compromise
> resolution [1]) are relevant when considering this LC comment.
> -- 
> Mike Smith
> Clark & Parsia
> [ISSUE-133] http://www.w3.org/2007/OWL/tracker/issues/133
> [1] http://lists.w3.org/Archives/Public/public-owl-wg/2008Sep/ 
> 0017.html
Received on Monday, 9 February 2009 12:37:23 UTC

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