Wikipedia>The Evil IP address: fixed dashes using a script

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{{Short description|Collaboratively edited multilingual knowledge graph hosted by the Wikimedia Foundation}}
{{Selfref|For Wikipedia's information page on Wikidata, see [[Wikipedia:Wikidata]].}}
{{Primary sources|date=December 2020}}
{{Use dmy dates|date=January 2021}}{{Infobox website
| logo = Wikidata-logo-en.svg
| collapsible = yes
| screenshot = Wikidata main page screenshot.png
| caption = Main page of Wikidata in April 2021
| url = {{Official URL}} {{Wd|references|linked|P407}}
| commercial = No
| type = {{hlist|class=nowrap |[[Knowledge base]] |[[Wiki]]}}
| registration = Optional
| language = Multiple languages
| owner = [[Wikimedia Foundation]]
| editor = {{Wd|properties|linked|references|linked|P50}}
| author =
| name = Wikidata
| location =
| launch_date = {{start date and age|2012|10|29|df=y}}{{Wd|references|P571}}
}}

'''Wikidata''' is a [[Wiki|collaboratively edited]] [[multilingual]] [[knowledge graph]] hosted by the [[Wikimedia Foundation]]. It is a common source of [[open data]] that Wikimedia projects such as [[Wikipedia]],<ref name="Wikidata Main Page archive"/><ref>{{cite web |url=http://www.wikimedia.de/wiki/Pressemitteilungen/PM_3_12_Wikidata_EN |title=Data Revolution for Wikipedia |date=March 30, 2012 |publisher=Wikimedia Deutschland |access-date=September 11, 2012 |archive-url=https://www.webcitation.org/6AbXpDAbW?url=http://www.wikimedia.de/wiki/Pressemitteilungen/PM_3_12_Wikidata_EN |archive-date=September 11, 2012 |url-status=live}}</ref> and anyone else, can use under the [[CC0]] [[public domain]] license. Wikidata is a wiki powered by the software [[MediaWiki]], and is also powered by the set of knowledge graph MediaWiki extensions known as [[Wikibase]].

==Concept==
[[File:Datamodel in Wikidata.svg|thumb|upright=2.74|center|{{center|This diagram shows the most important terms used in Wikidata.}}]]

Wikidata is a [[document-oriented database]], focused on items, which represent any kind of topics, concepts, or objects. Each item is allocated a unique, [[persistent identifier]], a positive integer prefixed with the upper-case letter Q, known as a "QID". This enables the basic information required to identify the topic that the item covers to be translated without favouring any language.

Examples of items include {{Wikidata entity link|Q8470}}, {{Wikidata entity link|Q316}}, {{Wikidata entity link|Q42775}}, {{Wikidata entity link|Q303}}, and {{Wikidata entity link|Q36611}}.

Item labels need not be unique. For example, there are two items named "Elvis Presley": {{Wikidata entity link|Q303}}, which represents [[Elvis Presley|the American singer and actor]], and {{Wikidata entity link|Q610926}}, which represents his [[Elvis Presley (album)|self-titled album]]. However, the combination of a label and its description must be unique. To avoid ambiguity, an item's unique identifier (''QID'') is therefore linked to this combination.

Item types are general and lexemes.{{Clarify|date = April 2021}}

===Main parts===
[[File:Wikidata layout Phase I.png|alt=Wikidata screenshot|center|700px|thumb| A layout of the four main components of a phase-1 Wikidata page: the label, description, aliases and interlanguage links. ]]

Fundamentally, an item consists of:

* Obligatorily, an [[identifier]] (the QID), related to a label and a description.
* Optionally, multiple aliases and some number of statements (and their properties and values).

===Statements===
[[Image:Wikidata statements Mars.png|alt=Wikidata screenshot|thumb|700px|center|Three statements from [[Wikidata:Q111|Wikidata's item on the planet Mars]] (Q111). Values include links to other items and to [[Wikimedia Commons]].]]

Statements are how any information known about an item is recorded in Wikidata. Formally, they consist of [[attribute–value pair|key–value pairs]], which match a ''property'' (such as "author", or "publication date") with one or more entity ''values'' (such as "[[Sir Arthur Conan Doyle]]" or "1902"). For example, the informal English statement "milk is white" would be encoded by a statement pairing the property {{Wikidata entity link|P462}} with the value {{Wikidata entity link|Q23444}} under the item {{Wikidata entity link|Q8495}}.

Statements may map a property to more than one value. For example, the "occupation" property for [[Marie Curie]] could be linked with the values "physicist" and "chemist", to reflect the fact that she engaged in both occupations.<ref>{{Cite web|url=https://www.wikidata.org/wiki/Help:Statements|title=Help:Statements – Wikidata|website=www.wikidata.org}}</ref>

Values may take on many types including other Wikidata items, strings, numbers, or media files. Properties prescribe what types of values they may be paired with. For example, the property {{Wikidata entity link|P856}} may only be paired with values of type "URL".<ref>{{Cite web|url=https://www.wikidata.org/wiki/Help:Data_type|title=Help:Data type – Wikidata|website=www.wikidata.org}}</ref>

===Property and value===
[[File:Wikidata - simple statement.svg|thumb|center|500px|Example of a simple statement consisting of one property–value pair]]

Wikidata's method of structuring data involves two main elements: properties and values of said properties (termed "items" in Wikidata's terminology).<ref>{{Cite Q|Q18507561|author1=Vrandečić, Denny|author2=Krötzsch, Markus}}</ref><ref>{{Cite Q|Q68471881|author1=Turki, Houcemeddine|author2=Shafee, Thomas|author3=Hadj Taieb, Mohamed Ali|author4=Ben Aouicha, Mohamed|author5=Vrandečić, Denny|author6=Das, Diptanshu|author7=Hamdi, Helmi}}</ref>

A property describes the data value of a statement and can be thought of as a category of data, for example, {{Wikidata entity link|P462}} for the data value {{Q|1088}} or education for a person item.

As said, ''properties'', when paired with ''values'', form a ''statement'' in Wikidata.

The most used property is {{Wikidata entity link|P2860}}, which is used on more than {{formatnum:210000000}} item pages.<ref>{{cite web|url=https://www.wikidata.org/wiki/Wikidata:Database_reports/List_of_properties/Top100|title=Wikidata:Database reports/List of properties/Top100|accessdate=26 March 2021}}</ref>

Properties have their own pages on Wikidata and as an item can include several properties, this results in a linked data structure of pages, under the same statement.

Properties may also define more complex rules about their intended usage, termed ''constraints''. For example, the {{Wikidata entity link|P36}} property includes a "single value constraint", reflecting the reality that (typically) territories have only one capital city. Constraints are treated as testing alerts and hints, rather than inviolable rules.<ref>{{Cite web|url=https://www.wikidata.org/wiki/Help:Property_constraints_portal|title=Help:Property constraints portal – Wikidata|website=www.wikidata.org}}</ref>

Optionally, ''qualifiers'' can be used to refine the meaning of a statement by providing additional information that applies to the scope of the statement, within the values. For example, the property "population" could be modified with a qualifier such as "as of 2011". Values in the statements may also be annotated with ''references'', pointing to a source backing up the statement's content.<ref>{{Cite web|url=https://www.wikidata.org/wiki/Help:Sources|title=Help:Sources – Wikidata|website=www.wikidata.org}}</ref>

===Lexemes===
In [[linguistics]], a [[lexeme]] is a unit of [[Lexical semantics|lexical]] meaning. Similarly, Wikidata's ''lexemes'' are items with a structure that makes them more suitable to store [[Lexicography|lexicographical]] data. Besides storing the language to which the lexeme refers, they have a section for ''forms'' and a section for ''senses''.<ref>{{Cite web|url=https://www.wikidata.org/wiki/Wikidata:Lexicographical_data/Documentation|title=Wikidata:Lexicographical data/Documentation – Wikidata|website=www.wikidata.org}}</ref>

==Development==
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 [[Euro|€]]1.3 million.<ref>{{cite news |title=Paul Allen Invests In A Massive Project To Make Wikipedia Better |first=Boonsri |last=Dickinson |url=http://www.businessinsider.com/paul-allen-invests-in-wikidata-project-2012-3?IR=T |newspaper=Business Insider |date=March 30, 2012 |access-date=September 11, 2012 }}</ref><ref>{{cite news |title=Wikipedia's Next Big Thing: Wikidata, A Machine-Readable, User-Editable Database Funded By Google, Paul Allen And Others |first=Sarah |last=Perez |url=https://techcrunch.com/2012/03/30/wikipedias-next-big-thing-wikidata-a-machine-readable-user-editable-database-funded-by-google-paul-allen-and-others/ |newspaper=TechCrunch |date=March 30, 2012 |access-date=September 11, 2012 |archive-url=https://www.webcitation.org/6AbXqmANO?url=http://techcrunch.com/2012/03/30/wikipedias-next-big-thing-wikidata-a-machine-readable-user-editable-database-funded-by-google-paul-allen-and-others/ |archive-date=September 11, 2012 |url-status=live}}</ref> The development of the project is mainly driven by [[Wikimedia Deutschland]] under the management of [[Lydia Pintscher]], and was originally split into three phases:<ref name=wikidata_on_meta>{{Cite web|url=https://meta.wikimedia.org/wiki/Wikidata|title=Wikidata – Meta|website=meta.wikimedia.org}}</ref>
# Centralising interlanguage links – links between Wikipedia articles about the same topic in different languages.
# Providing a central place for [[infobox]] data for all Wikipedias.
# Creating and updating list articles based on data in Wikidata and linking to other Wikimedia sister projects, including [[Meta-Wiki]] and the own Wikidata (interwikilinks).

===Initial rollout===
{| class="wikitable"
|+
|width=50%| [[Image:Interlanguage links prior to Wikidata.png|alt=Wikipedia screenshot|thumb|center|300px| A Wikipedia 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.]]
|
|width=50%|[[Image:Interlanguage links provided by WikiData.png|alt=Wikidata screenshot|thumb|center|300px|The "Edit links" link ''nowadays'' takes the reader to Wikidata to edit interlanguage and interwiki links.]]
|}

Wikidata was launched on 29 October 2012 and was the first new project of the Wikimedia Foundation since 2006.<ref name="Wikidata Main Page archive">[http://www.wikidata.org Wikidata] ({{webarchive |url=https://www.webcitation.org/6BnYRmONz?url=http://www.wikidata.org/wiki/Wikidata:Main_Page |date=October 30, 2012 }})</ref><ref>{{cite mailing list |url=http://lists.wikimedia.org/pipermail/wikidata-l/2012-October/001151.html |title=wikidata.org is live (with some caveats) |date=October 30, 2012 |access-date=November 3, 2012 |mailing-list=wikidata-l |last=Pintscher |first=Lydia}}</ref><ref>{{cite news |title=The Wikipedia data revolution |first=Matthew |last=Roth |url=https://diff.wikimedia.org/2012/03/30/the-wikipedia-data-revolution/ |publisher=Wikimedia Foundation |date=March 30, 2012 |access-date=September 11, 2012 |archive-url=https://www.webcitation.org/6AbXpnJB6?url=https://diff.wikimedia.org/2012/03/30/the-wikipedia-data-revolution/ |archive-date=September 11, 2012 |url-status=live}}</ref> At this time, only the centralization of language links 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 Wikipedia (interwikipedia links).

Historically, a Wikipedia article would include a list of [[Help:Interlanguage links|interlanguage links]], being links to articles on the same topic in other editions of Wikipedia, if they existed. Initially, Wikidata was a self-contained [[Repository (version control)|repository]] of interlanguage links.<ref>{{Cite book|last=Leitch|first=Thomas|author-link=Thomas Leitch|title=Wikipedia U: Knowledge, Authority, and Liberal Education in the Digital Age|date=2014-11-01|publisher=[[Johns Hopkins University Press]]|isbn=978-1-4214-1550-5|language=en|page=[https://books.google.com/books?id=lUxjBAAAQBAJ&pg=PA120 120]}}</ref> Wikipedia language editions were still not able to access Wikidata, so they needed to continue to maintain their own lists of interlanguage links, mainly at the end of the articles' pages.{{Citation needed|date=June 2020}}

On 14 January 2013, the [[Hungarian Wikipedia]] became the first to enable the provision of interlanguage links via Wikidata.<ref>{{cite web |url=http://blog.wikimedia.de/2013/01/14/first-steps-of-wikidata-in-the-hungarian-wikipedia/ |title=First steps of Wikidata in the Hungarian Wikipedia |publisher=Wikimedia Deutschland |date=14 January 2013 |access-date=17 December 2015 |author=Pintscher, Lydia}}</ref> This functionality was extended to the [[Hebrew Wikipedia|Hebrew]] and [[Italian Wikipedia|Italian]] Wikipedias on 30 January, to the [[English Wikipedia]] on 13 February and to all other Wikipedias on 6 March.<ref name="wmde 30 jan">{{cite web |url=http://blog.wikimedia.de/2013/01/30/wikidata-coming-to-the-next-two-wikipedias/ |title=Wikidata coming to the next two Wikipedias |publisher=Wikimedia Deutschland |access-date=January 31, 2013 |author=Pintscher, Lydia|date=2013-01-30 }}</ref><ref>{{cite web |url=http://blog.wikimedia.de/2013/02/13/wikidata-live-on-the-english-wikipedia/ |title=Wikidata live on the English Wikipedia |publisher=Wikimedia Deutschland |date=13 February 2013 |access-date=15 February 2013 |author=Pintscher, Lydia}}</ref><ref>{{cite web |url=http://blog.wikimedia.de/2013/03/06/wikidata-now-live-on-all-wikipedias/ |title=Wikidata now live on all Wikipedias |publisher=Wikimedia Deutschland |date=6 March 2013 |access-date=8 March 2013 |author=Pintscher, Lydia}}</ref><ref>{{cite news |url=http://www.golem.de/news/onlineenzyklopaedie-wikidata-ist-fuer-alle-wikipedien-da-1304-98941.html |title=Wikidata ist für alle Wikipedien da |publisher=Golem.de |language=de|access-date=29 January 2014}}</ref> After no consensus was reached over a proposal to restrict the removal of language links from the English Wikipedia,<ref>{{cite web |url=http://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Wikidata_interwiki_RFC&oldid=547663432 |title=Wikipedia talk:Wikidata interwiki RFC |date=March 29, 2013 |access-date=March 30, 2013}}</ref> the power to delete them from the English Wikipedia was granted to automatic editors ([[Internet bot|bot]]s). On 23 September 2013, interlanguage links went live on Wikimedia Commons.<ref>{{cite news|last1=Pintscher|first1=Lydia|title=Wikidata is Here!|url=https://commons.wikimedia.org/wiki/Commons:Village_pump/Archive/2013/10#Wikidata_is_here.21|publisher=[[c:Commons:Village pump|Commons:Village pump]]|date=23 September 2013}}</ref>

===Statements and data access===
On 4 February 2013, statements were introduced to Wikidata entries. The possible values for properties were initially limited to two data types (items and images on Wikimedia Commons), with more [[Data type|data types]] (such as [[Coordinate system|coordinates]] and dates) to follow later. The first new type, string, was deployed on 6 March.<ref>{{cite web|last=Pintscher|first=Lydia|title=Wikidata/Status updates/2013 03 01|url=http://meta.wikimedia.org/wiki/Wikidata/Status_updates/2013_03_01|work=Wikimedia Meta-Wiki|publisher=Wikimedia Foundation|access-date=3 March 2013}}</ref>

The ability for the various language editions of Wikipedia to access data from Wikidata was rolled out progressively between 27 March and 25 April 2013.<ref>{{cite web |last=Pintscher |first=Lydia |title=You can have all the data! |url=http://blog.wikimedia.de/2013/03/27/you-can-have-all-the-data/ |publisher=Wikimedia Deutschland |date=27 March 2013 |access-date=28 March 2013}}</ref><ref>{{cite news |title=Wikidata goes live worldwide |publisher=The H |url=http://h-online.com/-1849479 | archive-url=https://web.archive.org/web/20140101031329/http://www.h-online.com/open/news/item/Wikidata-goes-live-worldwide-1849479.html | archive-date=1 January 2014 | date=2013-04-25 }}</ref> On 16 September 2015, Wikidata began allowing so-called ''arbitrary access'', or access from a given article of a Wikipedia to the statements on Wikidata 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.<ref>{{cite news|last1=Lydia|first1=Pintscher|title=Wikidata: Access to data from arbitrary items is here|url=https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)/Archive_140#Wikidata:_Access_to_data_from_arbitrary_items_is_here|access-date=30 August 2016|date=16 September 2015|publisher=[[Wikipedia:Village pump (technical)]]}}</ref> On 27 April 2016 arbitrary access was activated on Wikimedia Commons.<ref>{{cite news|last1=Lydia|first1=Pintscher|title=Wikidata support: arbitrary access is here|url=https://commons.wikimedia.org/wiki/Commons:Village_pump/Archive/2016/05#Wikidata_support:_arbitrary_access_is_here|access-date=30 August 2016|date=27 April 2016|publisher=[[c:Commons:Village pump|Commons:Village pump]]}}</ref>

According to a 2020 study, a large proportion of the data on Wikidata consists of entries imported en masse from other databases by [[Internet bot]]s, which helps to "break[] down the walls" of [[Information silo|data silo]]s.<ref>{{Cite Q|Q87830400|author1=Waagmeester, Andra|author2=Stupp, Gregory|author3=Burgstaller-Muehlbacher, Sebastian|author4=Good, Benjamin M|author5=Griffith, Malachi|author6=Griffith, Obi L|author7=Hanspers, Kristina|author8=Hermjakob, Henning|author9=Hudson, Toby S|author10=Hybiske, Kevin|author11-Keating, Sarah M}}</ref>

===Query service and other improvements===
On 7 September 2015, the Wikimedia Foundation announced the release of the Wikidata Query Service,<ref>https://query.wikidata.org/</ref> which lets users run queries on the data contained in Wikidata.<ref>{{Cite web|url=https://lists.wikimedia.org/pipermail/wikidata/2015-September/007042.html|title=[Wikidata] Announcing the release of the Wikidata Query Service - Wikidata - lists.wikimedia.org}}</ref> The service uses [[SPARQL]] as the query language. As of November 2018, there are at least 26 different tools that allow querying the data in different ways.<ref>{{Cite web|url=https://www.wikidata.org/wiki/Wikidata:Tools/Query_data|title=Wikidata:Tools/Query data – Wikidata|website=www.wikidata.org}}</ref>

On the other hand, in the Wiktionary lateral pane, the tools now include{{When|date=August 2020}} a "Wikidata item" to help create a new item and links to new pages.{{Citation needed|date=August 2020}} For example, this is useful when the item is only in the English Wiktionary and needs to be linked to another Wikimedia project, rather than to Wiktionaries in other languages.

Below is a SPARQL example to search an instance of (P31) television series (Q5398426) with the main subject (P921) about island (Q23442) and aviation accident (Q744913). However similar results can also be found directly on Wikipedia using [[Wikipedia:Category intersection#Using MediaWiki search to find category intersections|category intersections]] if the appropriate categories exist and are allowed.
<syntaxhighlight lang="sparql">
SELECT ?item ?itemLabel
WHERE {
?item wdt:P31 wd:Q5398426.
?item wdt:P921 wd:Q23442.
?item wdt:P921 wd:Q744913.
SERVICE wikibase:label {bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en".}
}
</syntaxhighlight>

Below is another SPARQL example to find an instance of (P31) television series (Q5398426) where cast member (P161) includes Daniel Dae Kim (Q299700) and Jorge Garcia (Q264914).
The television series condition prevents displaying a television series episode (Q21191270) / two-part episode (Q21664088) and does not show results that are a film (Q11424).
<syntaxhighlight lang="sparql">
SELECT ?item ?itemLabel
WHERE {
?item wdt:P31 wd:Q5398426.
?item wdt:P161 wd:Q299700.
?item wdt:P161 wd:Q264914.
SERVICE wikibase:label {bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en".}
}
</syntaxhighlight>

===Logo===
The bars on the [[:File:Wikidata-logo-en.svg|logo]] contain the word "WIKI" encoded in [[Morse code]].<ref>[[commons:File talk:Wikidata-logo-en.svg#Hybrid]]. Retrieved 2016-10-06.</ref> It was created by Arun Ganesh and selected through community decision.<ref>{{Cite web|url=https://blog.wikimedia.de/2012/07/13/und-der-gewinner-ist/|title=Und der Gewinner ist...|date=13 July 2012}}</ref>

==Reception==
In November 2014, Wikidata received the Open Data Publisher Award from the [[Open Data Institute]] "for sheer scale, and built-in openness".<ref>{{cite web|url=http://theodi.org/news/first-odi-open-data-awards-presented-by-sir-tim-berners-lee-and-sir-nigel-shadbolt|archive-url=https://web.archive.org/web/20160324003214/http://theodi.org/news/first-odi-open-data-awards-presented-by-sir-tim-berners-lee-and-sir-nigel-shadbolt|archive-date=2016-03-24|title=First ODI Open Data Awards presented by Sirs Tim Berners-Lee and Nigel Shadbolt}}</ref>

{{As of|2018|November}}, Wikidata information was used in 58.4% of all English Wikipedia articles, mostly for external identifiers or coordinate locations. In aggregate, data from Wikidata is shown in 64% of all [[List of Wikipedias|Wikipedias]]' pages, 93% of all [[Wikivoyage]] articles, 34% of all [[Wikiquote]]s', 32% of all [[Wikisource]]s', and 27% of Wikimedia Commons's. Usage in other [[Wikimedia Foundation]] projects is a testimonial.<ref>{{cite web|url=http://wdcm.wmflabs.org/WD_percentUsageDashboard/|title=Percentage of articles making use of data from Wikidata|access-date=15 November 2018|archive-date=15 November 2018|archive-url=https://web.archive.org/web/20181115114237/http://wdcm.wmflabs.org/WD_percentUsageDashboard/|url-status=dead}}</ref>

{{As of|2020|December}}, Wikidata's data was visualized by at least 20 other external tools<ref>{{Cite web|url=https://www.wikidata.org/wiki/Wikidata:Tools/Visualize_data|title=Wikidata:Tools/Visualize data – Wikidata|website=www.wikidata.org}}</ref> and at over 300 papers have been published about Wikidata.<ref>{{Cite web|url=https://scholia.toolforge.org/topic/Q2013|title=Scholia|website=Scholia}}</ref>

Wikidata's structured dataset has been used by [[virtual assistant]]s such as Apple's [[Siri]] and [[Amazon Alexa]].<ref>{{Cite news|last1=Simonite|first1=Tom|date=2019-02-18|title=Inside the Alexa-Friendly World of Wikidata|language=en-us|work=[[Wired (magazine)|Wired]]|url=https://www.wired.com/story/inside-the-alexa-friendly-world-of-wikidata/|access-date=2020-12-25|issn=1059-1028}}</ref>

==Applications==
* Mwnci extension can import data from Wikidata to [[LibreOffice Calc]] [[Spreadsheet|spreadsheets]]<ref>{{Cite web|url=https://gitlab.com/muishkin/mwnci---deep-spreadsheets|title=Rob Barry / Mwnci – Deep Spreadsheets|website=GitLab}}</ref>
* There are (at October 2019) discussions about using QID items in relation to what is being called QID emoji<ref>{{Cite web | url=https://www.unicode.org/review/pri408/ |title = Public Review Issues}}</ref>
* Wiki Explorer – Android application to discover things around you and micro editing Wikidata<ref>{{Cite web|url=https://play.google.com/store/apps/details?id=net.nosuefor.wikiexplorer|title=Wiki Explorer in the Google Play Store}}</ref>
* KDE Itinerary – a privacy conscious open source travel assistant that uses data from Wikidata<ref>{{Citation|last=Krause|first=Volker|title=KDE Itinerary – A privacy by design travel assistant|url=https://media.ccc.de/v/36c3-59-kde-itinerary-a-privacy-by-design-travel-assistant#t=33|language=en|access-date=2020-11-10}}</ref>

==See also==
{{Portal|Internet}}
{{div col|colwidth=20em}}
* [[Abstract Wikipedia]]
* [[BabelNet]]
* [[DBpedia]]
* [[Freebase (database)|Freebase]]
* [[Semantic MediaWiki]]
{{div col end}}


== References ==
{{Reflist}}

==Further reading==
* {{citation |url=https://www.theatlantic.com/technology/archive/2012/04/the-problem-with-wikidata/255564/ |work=[[The Atlantic]] |location=US |date= 6 April 2012 |title=The Problem With Wikidata |author=Mark Graham }}
* Claudia Müller-Birn, Benjamin Karran, Janette Lehmann, Markus Luczak-Rösch: ''[http://eprints.soton.ac.uk/377397/1/paper-1.pdf 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).

==External links==
{{Commons category}}
{{Scholia|topic}}
{{Wikiquote}}
* {{Official website|mobile=https://m.wikidata.org/}}
* Videos: [https://media.ccc.de/b/conferences/wikidatacon WikidataCon] on ''media.ccc.de''

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Wikidata - Revision history

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