Re: [Wikidata] [Wikidata-l] DBpedia-based RDF dumps for Wikidata

On Wed, May 20, 2015 at 10:34 AM, Gerard Meijssen <gerard.meijssen@gmail.com
> wrote:

> Hoi,
> Do I understand correctly that the information is all based on Wikipedia
> information and that a large part is NOT in Wikidata..
>

Hi Gerard,

This dataset originates directly from Wikidata so it's only statements that
exist in Wikidata atm.
With the mapping process we map Wikidata properties & classes to the
DBpedia ontology and transform the statements accordingly.

For instance
wdt:Q42 wkd:P31 Q5 ;
  wkd:P569 "11-03-1951"^^xsd:date.

will be transformed to
dbw:Q42 rdf:type dbo:Person; # plus all transitive types from the DBpedia
ontology
  dbo:birthDate  "11-03-1951"^^xsd:date.


> Can you say something about the mapping of the missing statements to
> DBpedia.
>
> How hard would it be to include the basic information about people like
> day of birth/death ??
>

If your point is to include missing Wikidata statements from DBpedia, this
can be a step towards towards this goal since now it is easy to compare the
differences.

Best,
Dimitris


> Thanks,
>       GerardM
>
> On 15 May 2015 at 12:28, Dimitris Kontokostas <
> kontokostas@informatik.uni-leipzig.de> 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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>>
>
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-- 
Kontokostas Dimitris