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Re: owl:sameAs use/misuse/abuse Re: homonym URIs

From: Bernard Vatant <bernard.vatant@mondeca.com>
Date: Fri, 15 Jun 2007 10:30:49 +0200
Message-ID: <46724E39.1090905@mondeca.com>
To: Tim Berners-Lee <timbl@w3.org>
Cc: semantic-web@w3.org



Tim Berners-Lee a écrit :
>> Although I agree with Pat below (see my previous message) suppose I 
>> (or Richard) disagree(s) and want(s) to stick to the assertion
>> http://dbpedia.org/resource/Berlin owl:sameAs 
>> http://sws.geonames.org/2950159/
>>
>> Does that mean that what I get from the two resources should be not 
>> only consistent RDF descriptions, but *identical descriptions* ?
>
> Absolutely not.   The URIS above stand for the same thing, but the 
> documents you get when you look them up (via 303 to 
> http://sws.geonames.org/2950159/about.rdf etc)  have different URIs 
> different from those of the city.
Indeed, that's exactly my point
>
> Different documents about the same thing is of course an essential 
> element of the world.
I understand that also. But is not 'A owl:sameAs B' intended to mean, by 
OWL definition, that in any context using the semantics of URIs, those 
semantics are the same for A and B, so whatever assertion is true of  A 
is true of B, so A and B can be used indifferently. But if through http 
protocol  you retrieve "what the owner of A declares is true of A" and 
"what the owner of B declares is true of B" (read : RDF descriptions of 
A and B), with no certitude whatsoever if those descriptions are 
consistent or not, that means http protocol is not a context where A and 
B have the same semantics.

I can live with that, but it seems at least hard to understand and 
harder to explain, if one judge by the everthread about it.
OTOH, if one uses owl:sameAs for URIs identifying resources which are 
*information resources*, then they should actually redirect to the same 
document. Yes?


-- 

*Bernard Vatant
*Knowledge Engineering
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Received on Friday, 15 June 2007 08:31:07 UTC

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