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Wikipedia's free, collaborative knowledge base

Wikidata is the free, collaborative knowledge base behind Wikipedia and many other Wikimedia projects. The Web site has been online since late 2012 and has since become an important data provider for Wikipedias in all languages. Ten thousands of users have contributed statements about millions of entities. In December 2013, Google announced that their own collaboratively edited knowledge base, Freebase, is to be discontinued in favour of Wikidata. The research group Knowledge-Based Systems is working in close cooperation with the development team behind Wikidata, and provides, e.g., the regular Wikidata RDF-Exports.

Development of Wikidata started in April 2012 with a team of developers based on the Berlin offices of Wikimedia Germany. The project was heavily inspired by Semantic MediaWiki and Markus Krötzsch has been acting as an architectural advisor to the project since its inception.

Journal Articles

Denny Vrandečić, Markus Krötzsch
Wikidata: a free collaborative knowledgebase
Commun. ACM, 57(10):78-85, 2014
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Markus Krötzsch, Denny Vrandečić, Max Völkel, Heiko Haller, Rudi Studer
Semantic Wikipedia
Journal of Web Semantics, 5:251--261, September 2007
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Proceedings Articles

Stanislav Malyshev, Markus Krötzsch, Larry González, Julius Gonsior, Adrian Bielefeldt
Getting the Most out of Wikidata: Semantic Technology Usage in Wikipedia’s Knowledge Graph
In Denny Vrandečić, Kalina Bontcheva, Mari Carmen Suárez-Figueroa, Valentina Presutti, Irene Celino, Marta Sabou, Lucie-Aimée Kaffee, Elena Simperl, eds., Proceedings of the 17th International Semantic Web Conference (ISWC'18), LNCS, to appear. Springer
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Adrian Bielefeldt, Julius Gonsior, Markus Krötzsch
Practical Linked Data Access via SPARQL: The Case of Wikidata
In Tim Berners-Lee, Sarven Capadisli, Stefan Dietze, Aidan Hogan, Krzysztof Janowicz, Jens Lehmann, eds., Proceedings of the WWW2018 Workshop on Linked Data on the Web (LDOW-18), volume 2073 of CEUR Workshop Proceedings, 2018.
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Markus Krötzsch
Ontologies for Knowledge Graphs?
In Alessandro Artale, Birte Glimm, Roman Kontchakov, eds., Proceedings of the 30th International Workshop on Description Logics (DL 2017), volume 1879 of CEUR Workshop Proceedings, July 2017.
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Maximilian Marx, Markus Krötzsch
SQID: Towards Ontological Reasoning for Wikidata
In Nadeschda Nikitina, Dezhao Song, eds., Proceedings of the ISWC 2017 Posters & Demonstrations Track, CEUR Workshop Proceedings, October 2017.
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Daniel Hernández, Aidan Hogan, Markus Krötzsch
Reifying RDF: What Works Well With Wikidata?
In Thorsten Liebig and Achille Fokoue, eds., Proceedings of the 11th International Workshop on Scalable Semantic Web Knowledge Base Systems, volume 1457 of CEUR Workshop Proceedings, 32-47, 2015.
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Fredo Erxleben, Michael Günther, Markus Krötzsch, Julian Mendez, Denny Vrandečić
Introducing Wikidata to the Linked Data Web
In Peter Mika, Tania Tudorache, Abraham Bernstein, Chris Welty, Craig A. Knoblock, Denny Vrandečić, Paul T. Groth, Natasha F. Noy, Krzysztof Janowicz, Carole A. Goble, eds., Proceedings of the 13th International Semantic Web Conference (ISWC 2014), volume 8796 of LNCS, 50-65, October 2014. Springer
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Markus Krötzsch, Denny Vrandečić, Max Völkel
Wikipedia and the Semantic Web - The Missing Links
Proceedings of Wikimania 2005 - The First International Wikimedia Conference, July 2005. Wikimedia Foundation
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Talks and Miscellaneous

Markus Krötzsch
Getting the most out of Wikidata
Invited presentation at Wiki Workshop 2018, 2018
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Markus Krötzsch
Wikidata as a Cultural Heritage Information Hub
Invited talk at the Europeana Network Association AGM 2016, November 2016
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