Open Data lecture on Wikidata at HTW Berlin 2015-01-12 Based on slides by Lydia.

1. WikidataThe free knowledge base that anyone can edit
Anja Jentzsch - @anjeve
Hasso Plattner Institute, Potsdam, Germany
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Open Data Lecture, HTW Berlin
2015/01/12

2. Imagine a world in which every
single human being can freely
share in the sum of all
knowledge.

4. 33 500 000 articles
1 900 000 000 edits
287 languages

5. But...

6. 1. low-tech
(but powerful)

7. What are the 10 biggest cities
that have a female mayor?

14. What are the 10 biggest cities
that have a female mayor?

15. 2. editor retention and recruiting

17. ha.wikipedia.org

18. 3. coverage and reach

19. English

20. French

21. Italian

22. Greek

23. Turkish

24. 1 000 000+ articles:
12 Wikipedias
100 000+ articles:
39 Wikipedias
total:
287 Wikipedias

25. Wikidata to the rescue!

26. A free knowledge base that
anyone can edit

27. Structured
Data is stored in a structured
form allowing easy access and
reuse
Collaborative
Data is maintained by Wikidata
editors (volunteers)
Free
Data stored in Wikidata is
published under a free license
Open
The software is also open and
free
What is Wikidata actually?

28. Multilingual
Editing, consuming, browsing and
reusing the data is fully
multilingual
Referenced
Wikidata can handle sources for
individual statements
Integrated
Client sites such as Wikipedia
are hooked up for direct data
access
What is Wikidata actually?

29. • REST API for read/write
• Full dumps of everything
• Many formats: JSON, XML, RDF, …
• CC0 license
• Stable IDs / URIs
• Linked Open Data standards
All Data is Available

34. https://www.wikidata.org/wiki/Q875138

35. The world according to Wikidata

36. • allows a lot of easy micro-contributions
• supports small languages
• allows easy data entry and editing
• automates some stuff currently done by hand
How does Wikidata help?

37. can handle qualifiers and sources

38. can handle
differing opinions
cc-by-sa 3.0 by BambooBeast

39. Time for some stats

40. 30 600 000+
language links removed

41. 27 000 000+
statements created

42. 14 000+
active editors
(ranks 5th among all Wikimedia projects)

43. 6600+
new Wikimedians

44. Visualizations

45. GeneaWiki
toolserver.org/~magnus/ts2/geneawiki

46. Wikidata tempo-spatial display
tools.wmflabs.org/wikidata-todo/tempo_spatial_display.html?q=Q12551

47. Wikidata Map Interface
tools.wmflabs.org/wikidata-analysis/map/map.html

48. Wikidata Map Interface
tools.wmflabs.org/wikidata-analysis/map/map.html

49. • large multilingual knowledge base with references
• huge amount of data under an open license
• for free!
• various data access points:API, Linked Data interface
• edited and maintained by a large community
• an example of introducing a major change to a huge
collaborative project
• run your own instance
What does Wikidata mean for the world
outside Wikimedia?

50. !
Open Data Publisher Award (2014)
Received at the Open Data Institute
by Nigel Shadbolt andTim Berners-Lee

51. " We’ve decided to help transfer the data in Freebase
to Wikidata, and in mid-2015 we’ll wind down the
Freebase service as a standalone project.
moves to Wikidata
Google, 2014-12-16
https://plus.google.com/u/0/109936836907132434202/posts/bu3z2wVqcQc

52. • Improved user experience
• Queries
• More tools
• Growing the ecosystem
!
wikidata.org/wiki/Wikidata:Development_plan
What 2015 will bring

53. What areYOU
going to do with Wikidata?

54. wikidata.org
@wikidata
#wikimedia-wikidata
wikidata-l@lists.wikimedia.org