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Re: DBpedia-based RDF dumps for Wikidata

From: Michael Brunnbauer <brunni@netestate.de>
Date: Fri, 15 May 2015 16:27:59 +0200
To: Dimitris Kontokostas <kontokostas@informatik.uni-leipzig.de>
Cc: "semantic-web@w3.org" <semantic-web@w3.org>
Message-ID: <20150515142759.GA27876@netestate.de>

Hello Dimitris,

I recently started working with the Wikidata RDF dump and what struck me as
great improvement over DBpedia is the missing separation of the ontology:
Wikidata things can be individuals, classes or subclasses so I expect much
more rdf:type and rdfs:subclassOf statements to reason with than with the
comparatively small DBpedia ontology.

So these mappings are a bit disappointing for me:

 "P31": {"rdf:type": "$getDBpediaClass"}
 "P279":{"rdfs:subClassOf": "$getDBpediaClass"} (DBpedia things can be subclasses now?)

I guess $getDBpediaClass will not return a match very often. Are there any 
plans to massively expand the DBpedia ontology and maybe make the DBpedia 
classes real citizens of DBpedia?

Regards,

Michael Brunnbauer

On Fri, May 15, 2015 at 01:28:51PM +0300, Dimitris Kontokostas wrote:
> Dear all,
> 
> Following up on the early prototype we announced earlier [1] we are happy
> to announce a consolidated Wikidata RDF dump based on DBpedia.
> (Disclaimer: this work is not related or affiliated with the official
> Wikidata RDF dumps)
> 
> We provide:
>  * sample data for preview http://wikidata.dbpedia.org/downloads/sample/
>  * a complete dump with over 1 Billion triples:
> http://wikidata.dbpedia.org/downloads/20150330/
>  * a  SPARQL endpoint: http://wikidata.dbpedia.org/sparql
>  * a Linked Data interface: http://wikidata.dbpedia.org/resource/Q586
> 
> Using the wikidata dump from March we were able to retrieve more that 1B
> triples, 8.5M typed things according to the DBpedia ontology along with 48M
> transitive types, 6.4M coordinates and 1.5M depictions. A complete report
> for this effort can be found here:
> http://svn.aksw.org/papers/2015/ISWC_Wikidata2DBpedia/public.pdf
> 
> The extraction code is now fully integrated in the DBpedia Information
> Extraction Framework.
> 
> We are eagerly waiting for your feedback and your help in improving the
> DBpedia to Wikidata mapping coverage
> http://mappings.dbpedia.org/server/ontology/wikidata/missing/
> 
> Best,
> 
> Ali Ismayilov, Dimitris Kontokostas, Sören Auer, Jens Lehmann, Sebastian
> Hellmann
> 
> [1]
> http://www.mail-archive.com/dbpedia-discussion%40lists.sourceforge.net/msg06936.html
> 
> -- 
> Dimitris Kontokostas
> Department of Computer Science, University of Leipzig & DBpedia Association
> Projects: http://dbpedia.org, http://http://aligned-project.eu
> Homepage:http://aksw.org/DimitrisKontokostas
> Research Group: http://aksw.org

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Received on Friday, 15 May 2015 14:28:23 UTC

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