Page:ARL White Paper on Wikidata Opportunities and Recommendations.pdf/22

 projects working with Wikidata is identifying the alignment of standard data models with the Wikidata model.

The values associated with properties may be restricted to only certain allowed values, such as other Wikidata items, or restricted to certain formatting. For example, any value entered as a Library of Congress authority ID is expected to be a "string of 1 or 2 lowercase letters, a 2- or 4-digit year and a sequence of 6 digits." This is typically expressed with a format as a regular expression statement on the property page.46

Figure 3. Property proposal for an architecture database maintained by the University of Washington Libraries. Most conversations about authorities are easy to advance in conversation with the Wikidata community, and property proposals are valuable opportunities for feedback and conversation about how to best restructure the property for it to work well in Wikidata's existing structure.

Wikidata's software. Wikibase, includes a number of features that make both Wikidata and linked data projects flexible. The software has a human-editable interface—encouraging individual contribution, and ARL White Paper on Wikidata: Opportunities and Recommendations