Structure of ACTIVITY_DEFINITION versionable object

ACTIVITY_DEFINITION

 -ACTIVITY_DECOMPS                                 (via PARENT_ACTIVITY_REFERENCE)
 -ACTIVITY_OBJECTIVES                              (via ACTIVITY_DEFINITION_REFERENCE)
 -ACTIVITY_USAGES                                  (via ACTIVITY_REFERENCE)
   -ACTOR_USAGES                                   (via ACTIVITY_USAGE_REFERENCE)
   -TRANSITIONS                                    (via SOURCE_ACT_USAGE_REFERENCE)
 -TRANSITIONS                                      (via SOURCE_ACTIVITY_REFERENCE)

Also included in this versionable object are:

- Any user defined EXTENDED_STRUCTURE_ELEMENTS owned by the above

- Any TAGGED_VALUES and/or ELEMENT_RULE_USAGES for the above