a Non-Legal-Ownership between an Actor and an Activity whereby the Actor is responsible for the Activity.
(=> (Activity-Owner ?Actor)
(Exists (?Activity-Ownership)
(And (Activity-Ownership ?Activity-Ownership)
(Owning-Actor ?Activity-Ownership ?Actor))))
(<=> (Activity-Owner ?Actor)
(And (Actor ?Actor)
(Exists (?Activity-Ownership)
(And (Activity-Ownership ?Activity-Ownership)
(Owning-Actor ?Activity-Ownership ?Actor)))))