Feature summary:

A Wikidata item should have the rel="me" attribute on any link in an external identifier statement.

Use case(s):

This would enable services to recognize that the Wikidata item represents the same entity as the linked external database record. For example, a notable user on Mastodon could add a verified link from their profile to the Wikidata item about them. It is already possible for the Mastodon user to link to the Wikidata item, but Mastodon will only mark the link as “verified” if the item contains a rel="me" link back to the Mastodon profile. Mastodon will recognize the link back to the Mastodon profile in a Mastodon address (P4033) statement.

Benefits:

Wikidata’s identifier statements are useful as a hub for all the different records about an entity across the Web. Although Mastodon is a somewhat contrived example, other sites might use XFN’s rel="me" microformat to distinguish Wikidata’s authority control coverage from other external links.

Unlike T322717 and T31968, this feature would be scoped to entities who satisfy Wikidata’s notability criteria, not necessarily Wikimedians (although there is some overlap).