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Wikibase as an Infrastructure for Knowledge Graphs: The EU Knowledge Graph

Part of the Lecture Notes in Computer Science book series (LNISA,volume 12922)

Abstract

Knowledge graphs are being deployed in many enterprises and institutions. An easy-to-use, well-designed infrastructure for such knowledge graphs is not obvious. After the success of Wikidata, many institutions are looking at the software infrastructure behind it, namely Wikibase.

In this paper we introduce Wikibase, describe its different software components and the tools that have emerged around it. In particular, we detail how Wikibase is used as the infrastructure behind the “EU Knowledge Graph”, which is deployed at the European Commission. This graph mainly integrates projects funded by the European Union, and is used to make these projects visible to and easily accessible by citizens with no technical background.

Moreover, we explain how this deployment compares to a more classical approach to building RDF knowledge graphs, and point to other projects that are using Wikibase as an underlying infrastructure.

Keywords

  • Knowledge graph
  • Wikibase
  • EU Knowledge Graph

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Notes

  1. 1.

    https://wikiba.se.

  2. 2.

    https://www.wikidata.org.

  3. 3.

    https://www.wikidata.org/wiki/Wikidata:Statistics.

  4. 4.

    The exact number is growing every day and can be tracked at https://w.wiki/3BSZ.

  5. 5.

    https://www.wikidata.org/wiki/Wikidata:Development_plan#Wikibase_ecosystem.

  6. 6.

    https://linkedopendata.eu.

  7. 7.

    https://kohesio.eu.

  8. 8.

    https://www.springernature.com/gp/researchers/scigraph.

  9. 9.

    http://taxgraph.informatik.uni-mannheim.de.

  10. 10.

    https://www.europeana.eu.

  11. 11.

    https://pro.europeana.eu/page/linked-open-data.

  12. 12.

    https://blog.google/products/search/introducing-knowledge-graph-things-not/.

  13. 13.

    https://medium.com/airbnb-engineering/scaling-knowledge-access-and-retrieval-at-airbnb-665b6ba21e95.

  14. 14.

    https://www.amazon.science/blog/building-product-graphs-automatically.

  15. 15.

    https://engineering.linkedin.com/blog/2016/10/building-the-linkedin-knowledge-graph.

  16. 16.

    https://www.semantic-mediawiki.org.

  17. 17.

    https://github.com/wmde/wikibase-docker.

  18. 18.

    https://www.mediawiki.org/wiki/Extension:Wikibase_Repository.

  19. 19.

    https://www.mediawiki.org/wiki/Extension:Wikibase_Client.

  20. 20.

    https://www.mediawiki.org/wiki/Extension:Wikibase_Quality_Extensions.

  21. 21.

    https://www.mediawiki.org/wiki/Extension:WikibaseLexeme.

  22. 22.

    https://mariadb.com.

  23. 23.

    For a full database schema, one can refer to https://www.mediawiki.org/w/index.php?title=Manual:Database_layout/diagram&action=render.

  24. 24.

    https://www.mediawiki.org/wiki/Wikibase/Schema.

  25. 25.

    https://www.mediawiki.org/wiki/Wikibase/API.

  26. 26.

    https://www.mediawiki.org/wiki/Manual:Pywikibot.

  27. 27.

    https://www.mediawiki.org/wiki/Wikidata_Toolkit.

  28. 28.

    https://github.com/wikimedia/wikibase-javascript-api.

  29. 29.

    https://www.wikidata.org/wiki/Wikidata:Bots.

  30. 30.

    https://openrefine.org/.

  31. 31.

    https://github.com/wetneb/openrefine-wikibase/.

  32. 32.

    https://github.com/Wikidata/WikibaseImport.

  33. 33.

    https://www.wikidata.org/wiki/Help:QuickStatements.

  34. 34.

    https://github.com/LeMyst/WikibaseIntegrator.

  35. 35.

    https://www.mediawiki.org/wiki/Extension:WikibaseManifest.

  36. 36.

    https://www.mediawiki.org/wiki/Extension:EntitySchema.

  37. 37.

    https://github.com/the-qa-company/WikibaseSync.

  38. 38.

    https://www.mediawiki.org/wiki/Manual:Pywikibot.

  39. 39.

    https://linkedopendata.eu/entity/Q242372.

  40. 40.

    Like https://linkedopendata.eu/entity/Q77409.

  41. 41.

    Like https://linkedopendata.eu/entity/Q2529763.

  42. 42.

    https://ec.europa.eu/cefdigital/wiki/display/CEFDIGITAL/eTranslation.

  43. 43.

    https://nominatim.openstreetmap.org.

  44. 44.

    https://ec.europa.eu/eurostat/web/nuts/background.

  45. 45.

    Most of the code is published as open source at https://github.com/ec-doris.

  46. 46.

    https://wikibase-registry.wmflabs.org (the full list of instances can be accessed at https://tinyurl.com/y8xun3wy).

  47. 47.

    https://www.dnb.de.

  48. 48.

    Galleries, libraries, archives, and museums.

  49. 49.

    https://database.factgrid.de/wiki/Main_Page.

  50. 50.

    https://commons.wikimedia.org/wiki/Commons:Structured_data.

  51. 51.

    https://wcqs-beta.wmflabs.org.

  52. 52.

    https://rhizome.org/art/artbase/.

  53. 53.

    https://www.cegesoma.be.

  54. 54.

    https://adochs.arch.be.

  55. 55.

    https://linkingthepast.org.

  56. 56.

    https://doc.wikimedia.org/Wikibase/master/php/md_docs_components_repo-federated-properties.html.

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Acknowledgements

We would like to thank: Anne Thollard who initiated the Kohesio project and drove the use case internally at the European Commission; the team at DG REGIO for their support as domain experts and their precious advice; the team at DG CNECT for their initiative in investigating such an innovative approach and the technical deployments of the Kohesio user interface; DIGIT for following the project and giving feedback, in particular the helpful discussions with Ivo Velitchkov; Georgina Burnett and Jens Ohlig who coordinated the relationship between Wikimedia Deutschland and the European Commission. Finally we would like to thank the whole team of WMDE for providing great open source software, as well as the Wikidata editors for all the knowledge that they are providing every day!

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Correspondence to Dennis Diefenbach or Max De Wilde .

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Diefenbach, D., Wilde, M.D., Alipio, S. (2021). Wikibase as an Infrastructure for Knowledge Graphs: The EU Knowledge Graph. In: , et al. The Semantic Web – ISWC 2021. ISWC 2021. Lecture Notes in Computer Science(), vol 12922. Springer, Cham. https://doi.org/10.1007/978-3-030-88361-4_37

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