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.

knows

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

Thing > Property > knows

The most generic bi-directional social/work relation.

Usage: Between 100 and 1000 domains
Values expected to be one of these types
Person
Used on these types
Person

Schema Version 3.4