Hooray! ---------- Forwarded message ---------- From: Afraz Jaffri <[EMAIL PROTECTED]> Date: 2008/7/11 Subject: Ordnance Survey data as Linked Data (RE: How do you deprecate URIs? Re: OWL-DL and linked data) To: [EMAIL PROTECTED], [EMAIL PROTECTED]
We are pleased to announce a Linked Data site for the Ordnance Survey, available at: http://os.rkbexplorer.com with links from over 8000 URIs to Geonames URIs. Take 'Hampshire' as an example: http://os.rkbexplorer.com/description/osr7000000000017765 It might also be the right time, with all the owl:sameAs discussion, to practically demonstrate how our coreference system works. In the above example the link created is between 'Hampshire the county' from the OS and 'Hampshire the second order administrative division' from Geonames. We do not know if these two entities are exactly the same, so instead of using owl:sameAs we use our own coref:duplicate predicate. One of the features of our system is that knowledge about coreference is separated from the knowledge of the actual entity. In the RDF for the above URI at http://os.rkbexplorer.com/data/osr7000000000017765 you will find: <coref:coreferenceData rdf:resource="http://os.rkbexplorer. com/crs/osr7000000000017765"/> Resolving this URI will give you a 'bundle' containing the duplicates: <coref:Bundle> <coref:canon rdf:resource="http://os.rkbexplorer. com/id/osr7000000000017765"/> <coref:duplicate rdf:resource="http://os.rkbexplorer. com/id/osr7000000000017765" /> <coref:duplicate rdf:resource="http://sws.geonames.org/2647554/"/> <coref:lastUpdated>2008-07-10 11:39:44</coref:lastUpdated> </coref:Bundle> As you can see one URI is chosen as the canonical URI to use. The separation of coreference means, to a limited extent, that the context of duplication can be preserved. If I wanted to say that under some other context there were other URIs that were deemed to be the same then I can simply create another bundle with another <coref: coreferenceData> predicate in the RDF for the entity. Of course, the question of how to show the context is yet to be solved... There may be some errors in the equivalences. All feedback is greatfully received :) In relation to another question about how owl:sameAs is currently being used, there are some examples in our LDOW paper: http://eprints.ecs.soton.ac.uk/15181/ in particular http://dbpedia.org/resource/Welsh and http://dbpedia. org/resource/Lilac Regards, Afraz -- قبائلَ صوتي – على صمتها Earle Martin | http://downlode.org/
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