Changes
→See also: SPARQL
{{selfref|For Wikipedia's information page on Wikidata, please see [[Wikipedia:Wikidata]].}}
{{Infobox website
| logo = Wikidata-logo-en.svg
| screenshot = Wikidata.png
| caption = Main page of Wikidata
| url = {{Official URL}}<!-- {{Wd|properties|P856}} --> {{Wd|references|linked|P407}}
| commercial = No
| type = {{hlist|class=nowrap |[[Knowledge base]] |[[Wiki]]}}
| registration = Optional
| language = {{Wd|properties|linked|references|linked|P407}}
| owner = {{Wd|properties|linked|references|linked|P137}}
| author = {{Wd|properties|linked|references|linked|P50}}
| alexa = {{nowrap|{{DecreasePositive}} 10,789 {{smaller|({{as of|2018|10|01|alt=October 2018}})}}<ref name="alexa">{{cite web |title=Wikidata.org Traffic, Demographics and Competitors - Alexa |url=https://www.alexa.com/siteinfo/wikidata.org |website=www.alexa.com |accessdate=1 October 2018 |language=en}}</ref>}}
| name = Wikidata
| location =
| launch date = {{start date and age|2012|10|29|df=y}}<!-- {{Wd|properties|P571}} -->{{Wd|references|P571}}
}}
'''Wikidata''' is a [[Wiki|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 [[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 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXpDAbW |archivedate=September 11, 2012 |deadurl=no}}</ref> and by anyone else, under a [[public domain]] license. This is similar to the way [[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]].<ref>{{cite web|url=http://wikiba.se|title=Wikibase — Home|publisher=}}</ref>
==Concepts==
{{multiple image
<!--layout parameters-->
| align = right
| direction = vertical
| header = Screenshots
<!--all images-->
| width = 190
| caption_align = left
<!--image 1-->
| image1 = Wikidata statements Mars.png
| width1 = <!--set by the width parameter above-->
| alt1 = Wikidata screenshot
| caption1 = Three statements from [[Wikidata:Q111|Wikidata's item on the planet Mars]]. Values include links to other items and to [[Wikimedia Commons]].
<!--image 2-->
| image2 = Wikidata layout Phase I.png
| width2 = <!--set by the width parameter above-->
| alt2 = Wikidata screenshot
| caption2 = A layout of the four main components of a phase-1 Wikidata page: the label, description, aliases and interlanguage links.
<!--image 3-->
| image3 = Interlanguage links prior to Wikidata.png
| width3 = <!--set by the width parameter above-->
| alt3 = Wikipedia screenshot
| caption3 = 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.<br />[[:d:Q2013|Click here]] to visit the Wikidata entry for the article featured.
<!--image 4-->
| image4 = Interlanguage links provided by WikiData.png
| width4 = <!--set by the width parameter above-->
| alt4 = Wikidata screenshot
| caption4 = The "Edit links" link takes the reader to Wikidata to edit interlanguage links.
}}
Wikidata is a [[document-oriented database]], focused on items. Each item represents a topic (or an [[Wikipedia:Administration#Data structure and development|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 {{Wd|label|linked|Q7163}} is [[:d:Q7163|Q7163]] — known as a "QID". This enables the basic information required to identify the topic the item covers to be translated without favouring any language.
An item can have one or more statements. Information is added to items by creating statements, in the form of [[key-value pair]]s, with each statement consisting of a property (the key) and a value linked to the property.
[[File:Datamodel in Wikidata.svg|thumb|center|This diagram shows the most important terms used in Wikidata|484x484px]]
[[File:Wikidata_6th_birthday_celebration_Kerala.webm|thumb|right|Wikidata Birthday Celebration at Kerala]]
==Development history==
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 |accessdate=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 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXqmANO |archivedate=September 11, 2012 |deadurl=no}}</ref> Initial development of the project is being overseen by [[Wikimedia Deutschland]] and has been split into three phases:<ref name=wikidata_on_meta>{{cite web|url=https://meta.wikimedia.org/wiki/Wikidata|title=Wikidata - Meta|publisher=}}</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
===Phase 1===
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 |accessdate=November 3, 2012 |mailinglist=wikidata-l |last=Pintscher |first=Lydia}}</ref><ref>{{cite news |title=The Wikipedia data revolution |first=Matthew |last=Roth |url=http://blog.wikimedia.org/2012/03/30/the-wikipedia-data-revolution/ |publisher=Wikimedia Foundation |date=March 30, 2012 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXpnJB6 |archivedate=September 11, 2012 |deadurl=no}}</ref> 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 Wikipedia.
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 of interlanguage links. No Wikipedia 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 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 |accessdate=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 |accessdate=January 31, 2013 |author=Pintscher, Lydia}}</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 |accessdate=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 |accessdate=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=German|accessdate=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 |accessdate=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, phase 1 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>
===Phase 2===
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.<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|accessdate=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 |accessdate=28 March 2013}}</ref><ref>{{cite news |title=Wikidata goes live worldwide |publisher=The H |author= |url=http://h-online.com/-1849479 | archiveurl=https://web.archive.org/web/20140101031329/http://www.h-online.com/open/news/item/Wikidata-goes-live-worldwide-1849479.html | archivedate=3 January 2014 | date=2013-04-25 }}</ref>
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.<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|accessdate=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|accessdate=30 August 2016|date=27 April 2016|publisher=[[c:Commons:Village pump|Commons:Village pump]]}}</ref>
===Phase 3===
{{outdated|section|reason=the original phased plan seems moribund, or at least de facto unofficial|date=July 2018}}
Phase 3 will involve database querying and the creation of lists based on data stored on Wikidata.<ref name=wikidata_on_meta/> As of October 2016 two tools for querying Wikidata ([[Wikidata:Wikidata:List of queries|Wikidata:List of queries]]) were available: AutoList<ref>{{cite web|url=http://tools.wmflabs.org/autolist/|title=PetScan|publisher=}}</ref> and [[Wikipedia:PetScan|PetScan]],<ref>{{cite web|url=https://petscan.wmflabs.org/|title=PetScan|publisher=}}</ref> in addition to a public [[SPARQL]] endpoint.<ref>{{cite web|url=https://query.wikidata.org|title=Wikidata Query Service|publisher=}}</ref>
==Reception==
{{update section|date=August 2018}}
There is concern that the project is being influenced by lobbying companies, PR professionals and [[search engine optimization|search engine optimizers]].<ref name=Kolbe2015>{{cite news|first=Andrew|last=Kolbe|title=Unsourced, unreliable, and in your face forever: Wikidata, the future of online nonsense|url=https://www.theregister.co.uk/2015/12/08/wikidata_special_report/|work=[[The Register]]|date=December 8, 2015}}</ref>
{{As of|December 2015}}, according to Wikimedia statistics, half of the information in Wikidata is unsourced.<ref name=Kolbe2015/> Another 30% is labeled as having come from Wikipedia.<ref name=Kolbe2015/>
==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>
==See also==
{{Portal|Internet}}
* [[SPARQL]]
* [[BabelNet]]
* [[DBpedia]]
* [[Freebase]]
* [[Semantic MediaWiki]]
== 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 }}
* Denny Vrandečić, Markus Krötzsch: ''[http://korrekt.org/papers/Wikidata-CACM-2014.pdf Wikidata: A Free Collaborative Knowledge Base]''. Communications of the ACM. ACM. 2014 (preprint).
* 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|Wikidata}}
* {{official website|mobile=https://m.wikidata.org/}}
* Videos: [https://media.ccc.de/b/conferences/wikidatacon WikidataCon] on ''media.ccc.de''
{{Open data navbox}}
{{Wikimedia Foundation|state=expanded}}
{{Computable knowledge}}
[[Category:Advertising-free websites]]
[[Category:Articles containing video clips]]
[[Category:Computer-related introductions in 2012]]
[[Category:Creative Commons-licensed websites]]
[[Category:Internet properties established in 2012]]
[[Category:Knowledge bases]]
[[Category:Online databases]]
[[Category:Wikimedia projects]]
{{Infobox website
| logo = Wikidata-logo-en.svg
| screenshot = Wikidata.png
| caption = Main page of Wikidata
| url = {{Official URL}}<!-- {{Wd|properties|P856}} --> {{Wd|references|linked|P407}}
| commercial = No
| type = {{hlist|class=nowrap |[[Knowledge base]] |[[Wiki]]}}
| registration = Optional
| language = {{Wd|properties|linked|references|linked|P407}}
| owner = {{Wd|properties|linked|references|linked|P137}}
| author = {{Wd|properties|linked|references|linked|P50}}
| alexa = {{nowrap|{{DecreasePositive}} 10,789 {{smaller|({{as of|2018|10|01|alt=October 2018}})}}<ref name="alexa">{{cite web |title=Wikidata.org Traffic, Demographics and Competitors - Alexa |url=https://www.alexa.com/siteinfo/wikidata.org |website=www.alexa.com |accessdate=1 October 2018 |language=en}}</ref>}}
| name = Wikidata
| location =
| launch date = {{start date and age|2012|10|29|df=y}}<!-- {{Wd|properties|P571}} -->{{Wd|references|P571}}
}}
'''Wikidata''' is a [[Wiki|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 [[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 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXpDAbW |archivedate=September 11, 2012 |deadurl=no}}</ref> and by anyone else, under a [[public domain]] license. This is similar to the way [[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]].<ref>{{cite web|url=http://wikiba.se|title=Wikibase — Home|publisher=}}</ref>
==Concepts==
{{multiple image
<!--layout parameters-->
| align = right
| direction = vertical
| header = Screenshots
<!--all images-->
| width = 190
| caption_align = left
<!--image 1-->
| image1 = Wikidata statements Mars.png
| width1 = <!--set by the width parameter above-->
| alt1 = Wikidata screenshot
| caption1 = Three statements from [[Wikidata:Q111|Wikidata's item on the planet Mars]]. Values include links to other items and to [[Wikimedia Commons]].
<!--image 2-->
| image2 = Wikidata layout Phase I.png
| width2 = <!--set by the width parameter above-->
| alt2 = Wikidata screenshot
| caption2 = A layout of the four main components of a phase-1 Wikidata page: the label, description, aliases and interlanguage links.
<!--image 3-->
| image3 = Interlanguage links prior to Wikidata.png
| width3 = <!--set by the width parameter above-->
| alt3 = Wikipedia screenshot
| caption3 = 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.<br />[[:d:Q2013|Click here]] to visit the Wikidata entry for the article featured.
<!--image 4-->
| image4 = Interlanguage links provided by WikiData.png
| width4 = <!--set by the width parameter above-->
| alt4 = Wikidata screenshot
| caption4 = The "Edit links" link takes the reader to Wikidata to edit interlanguage links.
}}
Wikidata is a [[document-oriented database]], focused on items. Each item represents a topic (or an [[Wikipedia:Administration#Data structure and development|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 {{Wd|label|linked|Q7163}} is [[:d:Q7163|Q7163]] — known as a "QID". This enables the basic information required to identify the topic the item covers to be translated without favouring any language.
An item can have one or more statements. Information is added to items by creating statements, in the form of [[key-value pair]]s, with each statement consisting of a property (the key) and a value linked to the property.
[[File:Datamodel in Wikidata.svg|thumb|center|This diagram shows the most important terms used in Wikidata|484x484px]]
[[File:Wikidata_6th_birthday_celebration_Kerala.webm|thumb|right|Wikidata Birthday Celebration at Kerala]]
==Development history==
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 |accessdate=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 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXqmANO |archivedate=September 11, 2012 |deadurl=no}}</ref> Initial development of the project is being overseen by [[Wikimedia Deutschland]] and has been split into three phases:<ref name=wikidata_on_meta>{{cite web|url=https://meta.wikimedia.org/wiki/Wikidata|title=Wikidata - Meta|publisher=}}</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
===Phase 1===
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 |accessdate=November 3, 2012 |mailinglist=wikidata-l |last=Pintscher |first=Lydia}}</ref><ref>{{cite news |title=The Wikipedia data revolution |first=Matthew |last=Roth |url=http://blog.wikimedia.org/2012/03/30/the-wikipedia-data-revolution/ |publisher=Wikimedia Foundation |date=March 30, 2012 |accessdate=September 11, 2012 |archiveurl=https://www.webcitation.org/6AbXpnJB6 |archivedate=September 11, 2012 |deadurl=no}}</ref> 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 Wikipedia.
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 of interlanguage links. No Wikipedia 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 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 |accessdate=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 |accessdate=January 31, 2013 |author=Pintscher, Lydia}}</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 |accessdate=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 |accessdate=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=German|accessdate=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 |accessdate=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, phase 1 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>
===Phase 2===
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.<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|accessdate=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 |accessdate=28 March 2013}}</ref><ref>{{cite news |title=Wikidata goes live worldwide |publisher=The H |author= |url=http://h-online.com/-1849479 | archiveurl=https://web.archive.org/web/20140101031329/http://www.h-online.com/open/news/item/Wikidata-goes-live-worldwide-1849479.html | archivedate=3 January 2014 | date=2013-04-25 }}</ref>
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.<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|accessdate=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|accessdate=30 August 2016|date=27 April 2016|publisher=[[c:Commons:Village pump|Commons:Village pump]]}}</ref>
===Phase 3===
{{outdated|section|reason=the original phased plan seems moribund, or at least de facto unofficial|date=July 2018}}
Phase 3 will involve database querying and the creation of lists based on data stored on Wikidata.<ref name=wikidata_on_meta/> As of October 2016 two tools for querying Wikidata ([[Wikidata:Wikidata:List of queries|Wikidata:List of queries]]) were available: AutoList<ref>{{cite web|url=http://tools.wmflabs.org/autolist/|title=PetScan|publisher=}}</ref> and [[Wikipedia:PetScan|PetScan]],<ref>{{cite web|url=https://petscan.wmflabs.org/|title=PetScan|publisher=}}</ref> in addition to a public [[SPARQL]] endpoint.<ref>{{cite web|url=https://query.wikidata.org|title=Wikidata Query Service|publisher=}}</ref>
==Reception==
{{update section|date=August 2018}}
There is concern that the project is being influenced by lobbying companies, PR professionals and [[search engine optimization|search engine optimizers]].<ref name=Kolbe2015>{{cite news|first=Andrew|last=Kolbe|title=Unsourced, unreliable, and in your face forever: Wikidata, the future of online nonsense|url=https://www.theregister.co.uk/2015/12/08/wikidata_special_report/|work=[[The Register]]|date=December 8, 2015}}</ref>
{{As of|December 2015}}, according to Wikimedia statistics, half of the information in Wikidata is unsourced.<ref name=Kolbe2015/> Another 30% is labeled as having come from Wikipedia.<ref name=Kolbe2015/>
==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>
==See also==
{{Portal|Internet}}
* [[SPARQL]]
* [[BabelNet]]
* [[DBpedia]]
* [[Freebase]]
* [[Semantic MediaWiki]]
== 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 }}
* Denny Vrandečić, Markus Krötzsch: ''[http://korrekt.org/papers/Wikidata-CACM-2014.pdf Wikidata: A Free Collaborative Knowledge Base]''. Communications of the ACM. ACM. 2014 (preprint).
* 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|Wikidata}}
* {{official website|mobile=https://m.wikidata.org/}}
* Videos: [https://media.ccc.de/b/conferences/wikidatacon WikidataCon] on ''media.ccc.de''
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