Extensible select and enumeration types

and their elements in schema Message_arm taking into account BASED_ON types


 activity_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Applied_state_definition_assignment

 approval_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Message

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Applied_state_assignment
          Applied_state_definition_assignment
          State
          State_definition
          State_definition_relationship
          State_relationship

 date_or_date_time_item - EXTENSIBLE SELECT
          Message

 identification_item - EXTENSIBLE SELECT
          State_definition
          State_definition_relationship

 message_definer_select - EXTENSIBLE SELECT
          Organization
          Person_in_organization

 security_classification_item - EXTENSIBLE SELECT
          Message

 state_definition_of_item - EXTENSIBLE GENERIC_ENTITY SELECT

 state_of_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Message