Extensible select and enumeration types

and their elements in schema Location_assignment_arm taking into account BASED_ON types


 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          Location
          Location_relationship

 location_assignment_select - EXTENSIBLE GENERIC_ENTITY SELECT

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 product_based_location_representation - EXTENSIBLE GENERIC_ENTITY SELECT
          Product
          Product_version