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| '''[[w:Wikidata|Wikidata]]''' [http://wikidata.org (.org)] is a [[w:knowledge base|knowledge base]], an effort to store and serve structured data to [[Wikimedia]] wikis and to a more limited extent to other parties. Wikidata effort saw the daylight in [[2012]].
| | #REDIRECT [[Knowledge graphs#Wikidata]] |
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| The underlying software is the '''[[Wikibase]]''' which consists of 2 [[Mediawiki]] extensions, the repository extension and the client extension.
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| Wikibase allows [[interwiki]] links to be managed with Wikidata removing much contributor annoyanges, redundancy and error-proneness.
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| Wikidata is obviously a main source of [[reference]] level data once it is technically possible for non-WMF wikis to access the data items.
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| It can be accessed outside of WMF wikis with with
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| * [[wikidata:Wikidata:SPARQL_query_service/queries|Wikidata advice on how to query]] [https://query.wikidata.org/ Wikidata's endpoint] using [[SPARQL]].
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| * [[mw:Wikidata Toolkit]] is a way for Java programs to access data in the Wikidata repository.
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| * [https://rdflib.github.io/sparqlwrapper/ SPARQL Endpoint interface to Python]
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| * [[wikidata:Wikidata:Database download|Wikidata offers its database for download]]
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| Main entry point of any Wikidata item is a [[w:JSON|JSON]] dictionary, that has this form:
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| <code>{“labels”: by-language dictionary
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| “descriptions”: by-language dictionary
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| “aliases”: by-language dictionary
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| “claims”: list of property and values
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| “sitelinks”: by-language dictionary}</code>
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| == Useful information ==
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| * [[wikidata:Wikidata:Tools/External_tools|Wikidata's list of external tools that make use of Wikidata's knowledge]]
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| '''More info'''
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| * [[m:Wikidata|Metawiki on Wikidata]]
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| * [[w:Wikipedia:Wikidata|Wikipedia advice on Wikidata issues]]
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| == See also ==
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| * [[Database]] for a higher level view of what is going on with the databases
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| * [[Semantic MediaWiki]] is system for inputting and querying semantic data within the MediaWiki and it is implemented as extension(s).
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| * [[DBpedia]] the original structured data harvesting effort for the MediaWiki wikis
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