A relationship between an Actor and an Activity-Spec whereby the Actor is specified to perform all or part of the Activities as specified in the Activity-Spec
(=> (Specified-Doer ?X)
(Exists (?Activity-Spec)
(Specified-To-Execute ?X ?Activity-Spec)))
(<=> (Specified-Doer ?X)
(And (Actor ?X)
(Exists (?Activity-Spec)
(Specified-To-Execute ?X ?Activity-Spec))))