core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

sameAs

Canonical URL: http://schema.org/sameAs

Thing > Property > sameAs

URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.

Usage: Between 10,000 and 50,000 domains
Values expected to be one of these types
URL
Used on these types
Thing

Schema Version 3.2