Extensible select and enumeration types

and their elements in schema SHAPE_PROPERTY_ASSIGNMENT_MIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_file

 identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_file
          shape_representation

 item_identified_representation_usage_definition - EXTENSIBLE GENERIC_ENTITY SELECT
          represented_definition

 shape_model - EXTENSIBLE GENERIC_ENTITY SELECT
          shape_representation