Extensible select and enumeration types

and their elements in schema Planned_characteristic_arm taking into account BASED_ON types


 activity_item - EXTENSIBLE GENERIC_ENTITY SELECT

 approval_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Certification
          Contract

 assigned_name_select - EXTENSIBLE GENERIC_ENTITY SELECT
          External_class_library

 built_in_functions - EXTENSIBLE ENUMERATION
          attr_val

 certification_item - EXTENSIBLE GENERIC_ENTITY SELECT

 constants - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          Logical_representation_item

 contract_item - EXTENSIBLE SELECT

 date_or_date_time_item - EXTENSIBLE SELECT
          Certification
          Contract
          Organization_or_person_in_organization_assignment
          Security_classification_assignment

 documented_element_select - EXTENSIBLE SELECT
          Product
          Product_configuration
          Product_version
          Product_view_definition
          Property_value_representation
          Rule_set

 event_item - EXTENSIBLE GENERIC_ENTITY SELECT

 expression_syntax - EXTENSIBLE ENUMERATION
          express

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Document_definition
          File
          User_defined_library_or_dictionary

 identification_item - EXTENSIBLE SELECT
          Approval_status
          Contract
          Organization
          Requirement
          Requirement_version
          Requirement_view_definition
          Rule_set
          Security_classification

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 organization_or_person_in_organization_item - EXTENSIBLE SELECT
          Contract
          Identification_assignment
          Rule_action
          Security_classification_assignment

 project_item - EXTENSIBLE SELECT

 requirement_assignment_item - EXTENSIBLE SELECT

 requirement_source_item - EXTENSIBLE SELECT

 security_classification_item - EXTENSIBLE SELECT

 string_select - EXTENSIBLE GENERIC_ENTITY SELECT
          Approval
          Approval_relationship
          Approval_status
          Certification
          Contract
          Date_or_date_time_assignment
          Identification_assignment
          Organization_relationship
          Person_in_organization
          Project
          Project_assignment
          Project_relationship