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Re: Linked data and rdf:type in dbpedia

From: Bernard Vatant <bernard.vatant@mondeca.com>
Date: Mon, 21 May 2007 10:18:04 +0200
Message-ID: <465155BC.8050705@mondeca.com>
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
*3, citÚ 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:    Lešons de Choses <http://mondeca.wordpress.com/>
Received on Monday, 21 May 2007 08:18:24 UTC

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