- From: Bernard Vatant <bernard.vatant@mondeca.com>
- Date: Mon, 21 May 2007 10:18:04 +0200
- To: Chris Bizer <chris@bizer.de>
- Cc: SW-forum <semantic-web@w3.org>, Tim Berners-Lee <timbl@w3.org>
Hi Chris > Yes, you are right dbpedia:Category:English_people_by_county shouldn't > be a class. > > Our current approach to categorization/classification is to: > > - represent Wikipedia categories using the SKOS vocabulary. Therefore > you find all the skos:subject statements in the dataset. > - use rdf:type statements only for classes from the YAGO > classification, which forms a proper hirarchie. I think this could not be enough stressed. We have here an opportunity to show off the difference between a SKOS concept scheme (Wikipedia categories) and a RDFS or OWL ontology (YAGO, FOAF, hatever) and why in migration to SW representations, representing categories as OWL/RDFS classes is definitely not a good idea. Unfortunately, many transitions to SW representations are based on strong a priori such as "every concept is a class, and the hierarchy of concepts is an implicit subsumption". Indexing schemes and ontologies have to smoothly live together, supporting different types of queries. BTW this is an approach we've been using in Mondeca projects for years now. -- *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 Monday, 21 May 2007 08:18:24 UTC