- From: Bernard Vatant <bernard.vatant@mondeca.com>
- Date: Fri, 15 Jun 2007 10:30:49 +0200
- 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 ---------------------------------------------------- *Mondeca** *3, cité Nollez 75018 Paris France Web: www.mondeca.com <http://www.mondeca.com> ---------------------------------------------------- Tel: +33 (0) 871 488 459 Mail: bernard.vatant@mondeca.com <mailto:bernard.vatant@mondeca.com> Blog: Leçons de Choses <http://mondeca.wordpress.com/>
Received on Friday, 15 June 2007 08:31:07 UTC