A free knowledge base that can be read and
edited by humans and machines alike
What is WikiData?
●

A project by Wikimedia Deutschland

●

Launched October 2012

●

An interlinked database representing...
WIkimedia Commons
Centralising file storage
Centralising key data storage
Phases of Wikidata
1.Language/project links (done for some)
2.Statements (in progress)
3.Queries and lists (planned)
Phases of Wikidata
1.Language/project links (done for some)
2.Statements (in progress)
3.Queries and lists (planned)

Curr...
Phase 1 : Language links
●

Old : Each Wikipedia article
contains links to all other
Wikipedia pages about the
same topic ...
Phase 1 : Language links
●

●

●

Old : Each Wikipedia article
contains links to all other
Wikipedia pages about the
same ...
Items with statements
Label : One per item, per language

Item ID: one unique identifier “Qxxx” per item
Description : One...
Items with statements
Label : One per item, per language

Item ID: one unique identifier “Qxxx” per item
Description : One...
Property

Phase 2: Statements

Rank
Statement
Item reference
Qualifier(s)
Source(s)
Datatypes
Datatypes, depending on property:
●

Item reference

●

string

●

time (precision: from billion years to the se...
Browse in any language
English

Chinese

Scots
Using Wikidata in other projects
●

Show a statement value from the current
page's item in Wikipedia etc.

●

parser funct...
Metrics
●

As of February 2014

●

14 million items (English Wikipedia: <4.5M articles)

●

30 million statements
–

20 mi...
Statements per item over time
WikiData API
●

Extension of MediaWiki API

●

Full-”text” search

●

Request all statements/labels/links etc. for
individ...
The Wikidata
tools ecosystem
WikiData Query
●
●

●

●

Stand-alone WikiData query server
Uses data dumps and Recent Changes,
updated every 10 minutes
K...
Query editor
People related to Queen Elizabeth II
GeneaWiki
AutoLists
Tempo-spatial
display
●

●

●

●

Battles are “part of”
Franco-Prussian War
Battles have date or
date range
Battles have l...
Reasonator
•
•

•

•
•

•

•

•

Improved visualisation
Special displays by item
type (maps for locations,
relatives for p...
Map of all WikiData items
URLs
●
●

●

●

WikiData http://www.wikidata.org
WikiData Query http://wikidata-wdqmm.instance-proxy.wmflabs.org/
AutoList...
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2014-02-27 Wikidata talk Cambridge

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Introductory talk about Wikidata

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2014-02-27 Wikidata talk Cambridge

  1. 1. A free knowledge base that can be read and edited by humans and machines alike
  2. 2. What is WikiData? ● A project by Wikimedia Deutschland ● Launched October 2012 ● An interlinked database representing “the sum of all human knowledge” ● Centralising key data about “items” ● Serving data to other Wikimedia projects ● Serving machine-readable data to third parties ● MediaWiki extension (“WikiBase”) ● Fifth most active Wikimedia project!
  3. 3. WIkimedia Commons
  4. 4. Centralising file storage
  5. 5. Centralising key data storage
  6. 6. Phases of Wikidata 1.Language/project links (done for some) 2.Statements (in progress) 3.Queries and lists (planned)
  7. 7. Phases of Wikidata 1.Language/project links (done for some) 2.Statements (in progress) 3.Queries and lists (planned) Currently in phase 2 ● Wikipedia ● Wikivoyage ● Wikisource ● Wikimedia Commons (partial)
  8. 8. Phase 1 : Language links ● Old : Each Wikipedia article contains links to all other Wikipedia pages about the same topic in different languages
  9. 9. Phase 1 : Language links ● ● ● Old : Each Wikipedia article contains links to all other Wikipedia pages about the same topic in different languages New : WikiData contains links to all Wikipedia pages about an item ca. 250,000,000 language links removed!
  10. 10. Items with statements Label : One per item, per language Item ID: one unique identifier “Qxxx” per item Description : One per item, per language Alias : Multiple per item, per language
  11. 11. Items with statements Label : One per item, per language Item ID: one unique identifier “Qxxx” per item Description : One per item, per language Alias : Multiple per item, per language Statements : Multiple per item, per property Links : One per item, per language/project
  12. 12. Property Phase 2: Statements Rank Statement Item reference Qualifier(s) Source(s)
  13. 13. Datatypes Datatypes, depending on property: ● Item reference ● string ● time (precision: from billion years to the second) ● globe coordinate ● URL ● numbers (&precision) ● Commons media
  14. 14. Browse in any language English Chinese Scots
  15. 15. Using Wikidata in other projects ● Show a statement value from the current page's item in Wikipedia etc. ● parser function {{#property:PROPERTY}} ● scripts Lua mw.wikibase ● Usually “hidden away” in transcluded templates ● Popular on smaller Wikipedias
  16. 16. Metrics ● As of February 2014 ● 14 million items (English Wikipedia: <4.5M articles) ● 30 million statements – 20 million item references – 8 million strings – 1 million dates – 1 million coordinates – 20K quantities (those are new...)
  17. 17. Statements per item over time
  18. 18. WikiData API ● Extension of MediaWiki API ● Full-”text” search ● Request all statements/labels/links etc. for individual items ● Editing via API ● OAuth bindings ● No queries for statements => items!
  19. 19. The Wikidata tools ecosystem
  20. 20. WikiData Query ● ● ● ● Stand-alone WikiData query server Uses data dumps and Recent Changes, updated every 10 minutes Keeps all item-to-item links, strings, times, locations in RAM Can be queried over HTTP, returns JSON
  21. 21. Query editor
  22. 22. People related to Queen Elizabeth II
  23. 23. GeneaWiki
  24. 24. AutoLists
  25. 25. Tempo-spatial display ● ● ● ● Battles are “part of” Franco-Prussian War Battles have date or date range Battles have location link or coordinates Some have an image
  26. 26. Reasonator • • • • • • • • Improved visualisation Special displays by item type (maps for locations, relatives for people) Uses statements from related items Automatic description Iterates property trees (location, species, subclass) Timelines, auto-lists, related images Quick info in item link hoverboxes >100,000 views this month tools.wmflabs.org/reasonator
  27. 27. Map of all WikiData items
  28. 28. URLs ● ● ● ● WikiData http://www.wikidata.org WikiData Query http://wikidata-wdqmm.instance-proxy.wmflabs.org/ AutoList http://tools.wmflabs.org/wikidatatodo/autolist.html Reasonator http://tools.wmflabs.org/reasonator/
  29. 29. Concept cloud

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