An Activity_space is an Activity_or_state_space that consists of a set of instances of component Activity within a larger Activity.
NOTE - A discrete event view of an Activity is an Activity_space. Each member of the space is a finite part of the whole.
NOTE - An Activity_space is analogous to a Product_volume_space which contains finite components within a lumped parameter view of a Product_specification_or_set.
EXPRESS specification:
*) ENTITY Activity_space SUBTYPE OF (Activity_or_state_space); END_ENTITY; (*