More used as an abstract class. An actor here can be a person, group, organisation or software tool
(Inherited-Facet-Value Slot-Value-Type Epml-Activity Epml-Activity-Owner Epml-Actor) (Inherited-Facet-Value Slot-Value-Type Epml-Activity Epml-Activity-Doer Epml-Actor) (Inherited-Facet-Value Slot-Value-Type Epml-Resource Epml-Resource-Ownership Epml-Actor)