Extensible select and enumeration types

and their elements in schema MESSAGE_MIM taking into account BASED_ON types


 action_items - EXTENSIBLE GENERIC_ENTITY SELECT
          applied_state_type_assignment

 approval_item - EXTENSIBLE GENERIC_ENTITY SELECT
          structured_message

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          state_observed
          state_observed_assignment
          state_observed_relationship
          state_type
          state_type_assignment
          state_type_relationship

 date_and_time_item - EXTENSIBLE SELECT
          approval_person_organization
          structured_message

 date_item - EXTENSIBLE SELECT
          approval_person_organization
          structured_message

 identification_item - EXTENSIBLE SELECT
          state_type
          state_type_relationship

 organization_item - EXTENSIBLE SELECT
          structured_message

 person_and_organization_item - EXTENSIBLE SELECT
          structured_message

 security_classification_item - EXTENSIBLE SELECT
          structured_message

 state_observed_of_item - EXTENSIBLE GENERIC_ENTITY SELECT
          structured_message

 state_type_of_item - EXTENSIBLE GENERIC_ENTITY SELECT

 versionable_item - EXTENSIBLE SELECT