Extensible select and enumeration types

and their elements in schema Stock_material_arm taking into account BASED_ON types


 approval_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Stock_material

 assigned_name_select - EXTENSIBLE GENERIC_ENTITY SELECT
          External_class_library

 date_or_date_time_item - EXTENSIBLE SELECT

 documented_element_select - EXTENSIBLE SELECT
          Product
          Product_configuration
          Product_version
          Product_view_definition
          Property_value_representation

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Document_definition
          File
          User_defined_library_or_dictionary

 identification_item - EXTENSIBLE SELECT

 material_item_select - EXTENSIBLE GENERIC_ENTITY SELECT

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 organization_or_person_in_organization_item - EXTENSIBLE SELECT

 property_assignment_select - EXTENSIBLE SELECT

 represented_definition - EXTENSIBLE SELECT
          Assigned_property
          Independent_property