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.

opponent

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

Thing > Property > participant > opponent

A sub property of participant. The opponent on this action.
Values expected to be one of these types
Person
Used on these types
ExerciseAction
Super-properties
participant

Schema Version 3.3