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 39. “List of Wikipedias,” Wikipedia, last edited March 29, 2019, https://en.wikipedia.org/wiki/List_of_Wikipedias.

40. Wikimedia Commons, last edited March 18, 2019, http://commons.wikimedia.org.

41. Wikisource, last edited January 4, 2019, https://wikisource.org.

42. In Mediawiki, the core software underneath Wikidata, namespaces distinguish different types of data in a project, and create distinct storage spaces for that content.

43. For more information about items and how to create them, see “Help: Items,” Wikidata, last edited April 27, 2018, https://www.wikidata.org/wiki/Help:Items.

44. The authors recognize this description is a simplification of the potential issues related to the use of statements that can be changed and edited over time. This issue is discussed in more detail in Allison-Cassin and Scott, “Wikidata: A Platform for Your Library’s Linked Open Data,” and requires further discussion and investigation of the impacts and solutions in research libraries.

45. A complete list and tools to browse them can be accessed at “Wikidata: List of Properties,” Wikidata, last edited February 3, 2019, https://www.wikidata.org/wiki/Wikidata:List_of_properties; the current count of properties can be obtained from “Wikidata Propbrowse,” Hay’s Tools, accessed April 10, 2019, https://tools.wmflabs.org/hay/propbrowse/.

46. “Library of Congress Authority ID (P244),” Wikidata, last edited April 5, 2019, https://www.wikidata.org/wiki/Property:P244.

47. “QuickStatements,” Wikimedia Toolforge, accessed April 15, 2019, https://tools.wmflabs.org/quickstatements/#/.

48. OpenRefine website, accessed April 15, 2019, http://openrefine.org/. ARL White Paper on Wikidata: Opportunities and Recommendations