It’s a standard value in a property, with the datatype “uri”.
Thanks for your feedback: I added URIs to Wikipedia and Commons in the description of some sample items.
Can you suggest additional examples of access to Wikidata as information service, in order to have a better understanding of such feature?
All Omeka items are available as data : https://p-lod.umasscreate.net/api/items?id=1488 for the example above. Wikipedia works the same, like any semantic service in fact. You can query the data on wikipedia and display them as you want, see https://query.wikidata.org.
Thanks for your feedback.
Let’s take as example my item Madonna of Fossa.
The date of creation is the Property P571 of the Wikidata element Q17636011: see Wikidata Query Service.
I can edit manually the field dcterms:date including the value “1340”: is it possible to fill that field directly with the result of a Wikidata query?