An Activity_or_state_space_for_activity is a Fusion that is between an Activity and an Activity_or_state_space and that indicates the Activity is the whole membership of the Activity_or_state_space viewed as a single item.
EXPRESS specification:
*) ENTITY Activity_or_state_space_for_activity SUBTYPE OF (Fusion); class : Activity_or_state_space; whole : Activity; END_ENTITY; (*
Attribute definitions:
class: the Activity_or_state_space that has a membership comprising the whole.
whole: the Activity that can be decomposed into the members of the class.