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Wikidata: Metadata and Tagging

Subscribe 7 (Frühjahr 2016), Berlin

Jens Ohlig (Wikimedia Deutschland)

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Wikidata

Wikidata is a free linked database that can be read and edited by both humans and machines.

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Wikidata acts as central storage for the structured data of its Wikimedia sister projects including Wikipedia.

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Wikidata can be used by anyone for everything because all data is in the Public Domain (CC0).

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Giving more people more access to more knowledge

Wikidata

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What is Wikidata actually?

  • repository of the world's knowledge
  • database anyone can read and edit
  • multi-lingual
  • designed to deal with the reality Wikipedia has to deal with
  • free and open source software

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17,300,000+ items

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Items

  • Items are real things or concepts. eg. Berlin, Barack Obama, Helium and are identified using a unique ID e.g. Q76 or Q13813879

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  • Items have labels, descriptions, aliases, sitelinks and claims/statements

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A single piece of knowledge in the world

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Properties

  • Properties are used to label data e.g. “Born in” or “Date of Death” or “Location”

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Some feature that a piece of knowledge can have

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Statements

  • Statements hold information e.g.
    • P47 (shares border with) => Q64 (Berlin)
    • P1128 (employees) => 1,000+-100

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  • Statements also have
    • Qualifiers, to expand on the information
    • References, telling you where the information is from

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“This piece of knowledge has this feature (according to this source)”

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Item:

Berlin (Q64)

Statement: Q64 has P1082: 3.5 Mio

Property:

Population (P1082)

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wikidata.org/wiki/Q64

Example Item

Berlin

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Q64

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Largest cities with a female mayor

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Map of the U1 subway line in Berlin

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http://wikimedia.fi/2016/04/15/yle-3-wikidata/

Tagging at Yle (Finnish Broadcasting Company)

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Tagging for TED

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https://www.wikidata.org/wiki/Wikidata:TED

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Thank you! Any questions?

Jens Ohlig

jens.ohlig@wikimedia.de