Re: DBpedia-based RDF dumps for Wikidata

On May 15, 2015 6:59 PM, "Michael Brunnbauer" <brunni@netestate.de> wrote:
>
>
> Hello Dimitris,
>
> On Fri, May 15, 2015 at 05:50:24PM +0300, Dimitris Kontokostas wrote:
> > > I guess $getDBpediaClass will not return a match very often.
> > We got ~ 8M type statements using this mapping
>
> I found ca. 13M such statements in Wikidata so this seems to be a
reasonable
> success rate. But I count 19230 classes in Wikidata compared to 685 in
> DPpedia. There must be information loss. I see two possibilities:
>
> -The mapping includes subclassOf mappings to that X a Y gets translated to
>  X a Z where DBpedia class Z is a superclass of Wikidata class Y?
>
> -You are missing most of the less popular Wikidata classes

The latter, we targeted only popular classes for now
>
> > > Are there any
> > > plans to massively expand the DBpedia ontology and maybe make the
DBpedia
> > > classes real citizens of DBpedia?
> > >
> >
> > I am not sure I understand you suggestion exactly.
>
> I suspect that Wikidata will be more useful than DBpedia as it has much
more
> classes.

We do not want to replace the Wikidata dumps, just port a common subset
into the DBpedia data stack. We, and we hope other people as well will have
some use cases for this.

Best regards,
Dimitris

>
> > We already have
> > equivalent class links to Wikidata and the following as an open task
> > https://github.com/dbpedia/ontology-tracker/issues/5
> > Would something like this cover you
>
> No
>
> > or are you against standalone ontologies in general?
>
> No
>
> Regards,
>
> Michael Brunnbauer
>
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