Wikidata is a collaboratively edited knowledge base hosted by the
Wikimedia Foundation. It is intended to provide a common source of
data which can be used by Wikimedia projects such as,
and by anyone else, under a public domain license. This is similar to
Wikimedia Commons provides storage for media files and access
to those files for all Wikimedia projects, and which are also freely
available for reuse.
Wikidata is powered by the software Wikibase.
2 Development history
2.1 Phase 1
2.2 Phase 2
2.3 Phase 3
5 See also
7 Further reading
8 External links
Three statements from Wikidata's item on the planet Mars. Values
include links to other items and to Wikimedia Commons.
A layout of the four main components of a phase-1
Wikidata page: the
label, description, aliases and interlanguage links.
A article's list of interlanguage links as they appeared in
an edit box (left) and on the article's page (right) prior to
Wikidata. Each link in these lists is to an article that requires its
own list of interlanguage links to the other articles; this is the
information centralized by Wikidata.
Click here to visit the
Wikidata entry for the article featured.
The "Edit links" link takes the reader to
Wikidata to edit
Wikidata is a document-oriented database, focused on items. Each item
represents a topic (or an administrative page used to maintain
Wikipedia) and is identified by a unique number, prefixed with the
letter Q — for example, the item for the topic politics is Q7163 —
known as a "QID". This enables the basic information required to
identify the topic the item covers to be translated without favouring
An item can have one or more statements. Information is added to items
by creating statements, in the form of key-value pairs, with each
statement consisting of a property (the key) and a value linked to the
This diagram shows the most important terms used in Wikidata
The creation of the project was funded by donations from the Allen
Institute for Artificial Intelligence, the Gordon and Betty Moore
Foundation, and Google, Inc., totaling €1.3 million. Initial
development of the project is being overseen by Wikimedia Deutschland
and has been split into three phases:
Centralising interlanguage links – links between
articles about the same topic in different languages
Providing a central place for infobox data for alls
Creating and updating list articles based on data in Wikidata
Wikidata was launched on 30 October 2012 and was the first new project
Wikimedia Foundation since 2006. At this time, only
the first phase was available. This enabled items to be created and
filled with basic information: a label – a name or title, aliases
– alternative terms for the label, a description, and links to
articles about the topic in all the various language editions of
Historically, a article would include a list of
interlanguage links, being links to articles on the same topic in
other editions of, if present. Initially,
Wikidata was a
self-contained repository of interlanguage links. No
language editions were able to access Wikidata, so they needed to
continue to maintain their own lists of interlanguage links.
On 14 January 2013, the Hungarian became the first to enable
the provision of interlanguage links via Wikidata. This
functionality was extended to the Hebrew and Italians on 30
January, to the English on 13 February and to all other
Wikipedias on 6 March. After no consensus was reached
over a proposal to restrict the removal of language links from the
English, the power to delete them from the English
was granted to automatic editors (bots). On 23 September
2013, phase 1 went live on Wikimedia Commons.
The initial features of the second phase were deployed on 4 February
2013, introducing statements to
Wikidata entries. The values were
initially limited to two data types (items and images on Wikimedia
Commons), with more data types (such as coordinates and dates) to
follow later. The first new type, string, was deployed on 6 March.
The ability for the various language editions of to access
Wikidata was rolled out progressively between 27 March and
25 April 2013.
On 16 September 2015,
Wikidata began allowing so-called arbitrary
access, or access from a given
Wikidata item to the properties of
items not directly connected to it. For example, it became possible to
read data about Germany from the Berlin article, which was not
feasible before. On 27 April 2016 arbitrary access was activated
on Wikimedia Commons.
Phase 3 will involve database querying and the creation of lists based
on data stored on Wikidata. As of October 2016 two tools for
Wikidata (Wikidata:List of queries) were available:
AutoList and PetScan, additionally to a public SPARQL
There is concern that the project is being influenced by lobbying
companies, PR professionals and search engine optimizers.
As of December 2015[update], according to Wikimedia statistics, half
of the information in
Wikidata is unsourced. Another 30% is
labeled as having come from, but with no indication as to
The bars on the logo contain the word "WIKI" encoded in Morse
^ "Wikidata.org Site Info". Alexa Internet. Retrieved
^ a b
Wikidata (Archived October 30, 2012, at WebCite)
^ "Data Revolution for". Wikimedia Deutschland. March 30,
2012. Archived from the original on September 11, 2012. Retrieved
September 11, 2012.
Wikibase — Home".
^ Dickinson, Boonsri (March 30, 2012). "Paul Allen Invests In A
Massive Project To Make Better". Business Insider. Retrieved
September 11, 2012.
^ Perez, Sarah (March 30, 2012). "Wikipedia's Next Big Thing:
Wikidata, A Machine-Readable, User-Editable Database Funded By Google,
Paul Allen And Others". TechCrunch. Archived from the original on
September 11, 2012. Retrieved September 11, 2012.
^ a b "
Wikidata - Meta".
^ Pintscher, Lydia (October 30, 2012). "wikidata.org is live (with
some caveats)". wikidata-l (Mailing list). Retrieved November 3,
^ Roth, Matthew (March 30, 2012). "The data revolution".
Wikimedia Foundation. Archived from the original on September 11,
2012. Retrieved September 11, 2012.
^ Pintscher, Lydia (14 January 2013). "First steps of
Wikidata in the
Hungarian". Wikimedia Deutschland. Retrieved 17 December
^ Pintscher, Lydia. "
Wikidata coming to the next twos".
Wikimedia Deutschland. Retrieved January 31, 2013.
^ Pintscher, Lydia (13 February 2013). "
Wikidata live on the English
Wikipedia". Wikimedia Deutschland. Retrieved 15 February 2013.
^ Pintscher, Lydia (6 March 2013). "
Wikidata now live on all
Wikipedias". Wikimedia Deutschland. Retrieved 8 March 2013.
Wikidata ist für alle Wikipedien da" (in German). Golem.de.
Retrieved 29 January 2014.
Wikidata interwiki RFC". March 29, 2013. Retrieved
March 30, 2013.
^ Lydia, Pintscher (23 September 2013). "
Wikidata is Here!".
^ Pintscher, Lydia. "Wikidata/Status updates/2013 03 01". Wikimedia
Meta-Wiki. Wikimedia Foundation. Retrieved 3 March 2013.
^ Pintscher, Lydia (27 March 2013). "You can have all the data!".
Wikimedia Deutschland. Retrieved 28 March 2013.
Wikidata goes live worldwide". The H. 2013-04-25. Archived from the
original on 3 January 2014.
^ Lydia, Pintscher (16 September 2015). "Wikidata: Access to data from
arbitrary items is here".:Village pump (technical).
Retrieved 30 August 2016.
^ Lydia, Pintscher (27 April 2016). "
Wikidata support: arbitrary
access is here". Commons:Village pump. Retrieved 30 August 2016.
Wikidata Query Service".
^ a b c Kolbe, Andrew (December 8, 2015). "Unsourced, unreliable, and
in your face forever: Wikidata, the future of online nonsense". The
File talk:Wikidata-logo-en.svg#Hybrid. Retrieved 2016-10-06.
Mark Graham (6 April 2012), "The Problem With Wikidata", The Atlantic,
Denny Vrandečić, Markus Krötzsch: Wikidata: A Free Collaborative
Knowledge Base. Communications of the ACM. ACM. 2014 (preprint).
Claudia Müller-Birn, Benjamin Karran, Janette Lehmann, Markus
Luczak-Rösch: Peer-production system or collaborative ontology
development effort: What is Wikidata? In, OpenSym 2015 - Conference on
Open Collaboration, San Francisco, US, 19 - 21 Aug 2015 (preprint).
Wikimedia Commons has media related to Wikidata.
Official website (Mobile)
Videos: WikidataCon on media.ccc.de
Open science data
Open notebook science
Open data projects
Open energy system databases
Open access -
Open content -
Open education -
Open government - Open
Open knowledge -
Open science - Open source
Oscar van Dillen
List of Wiktionaries
List of Wikimedia chapters
Wikimedia v. NSA
Alphabet of human thought
Personal knowledge base
Ars Magna (1300)
An Essay towards a Real Character, and a Philosophical
Calculus ratiocinator and characteristica universalis (1700)
Dewey Decimal Classification (1876)
Logical atomism (1918)
Tractatus Logico-Philosophicus (1921)
Hilbert's program (1920s)
Incompleteness theorem (1931)
World Brain (1938)
General Problem Solver (1959)
Semantic Web (2001)
Wolfram Alpha (2009)
Knowledge Graph (2012)
The Engine (Gulliver's Travels, 1726)
Joe ("A Logic Named Joe", 1946)
The Librarian (Snow Crash, 1992)
Dr. Know (A.I. Artificial Intelligence, 2001)
Waterhouse (The Baroque Cycle, 2003)
See also: Logic machines in fiction and List of f