By Addshore (Own work) [CC0], via Wikimedia Commons

Wikidata: Collaborative Public-Domain Knowledge Graph

Case study by Daniel Mietchen, University of Virginia

Wikidata is the edit button for Linked Open Data ‒ a multilingual
collaborative database collecting structured data to provide support for
Wikipedias and their sister wikis, and to anyone in the world, including
various research communities across domains.

CS aspect: Data is entered and curated by Wikidata editors ‒ 18.000 people
contribute per month, in their language. They manage content, tools and
policies and integrate Wikidata with external resources like governmental,
cultural or research databases.

OS aspect: Wikidata is based on open standards, and every change to content
or software is recorded in public. The data is published under CC0 ‒ the
Creative Commons Public Domain Dedication 1.0 ‒ allowing for reuse without

Wikidata provides sustainable infrastructure (e.g. persistent
identifiers, queriability) that is useful to research in general, including
OS & CS. Openness & multilinguality broaden and stabilize the contributor,
user and funder communities.

Contact: Daniel Mietchen, Data Science Institute, University of Virginia

Image: By Addshore (Own work) [CC0], via Wikimedia Commons;

This case study is part of the DITOs Policy Brief "Citizen Science and Open Science: Synergies and Future Areas of Work".

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