Extensible select and enumeration types

and their elements in schema SINGLE_PART_REPRESENTATION_XIM taking into account BASED_ON types


 document_reference_item - EXTENSIBLE SELECT
          part
          part_version
          part_view_definition
          product
          product_definition
          product_definition_formation

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_definition
          document_file
          external_source
          externally_defined_class
          externally_defined_general_property
          file
          product_definition

 externally_versioned_item - EXTENSIBLE GENERIC_ENTITY SELECT
          externally_defined_general_property

 identification_item - EXTENSIBLE SELECT
          document_file
          shape_representation

 name_item - EXTENSIBLE GENERIC_ENTITY SELECT
          external_class_library

 organization_item - EXTENSIBLE SELECT
          class
          product
          product_definition
          product_definition_formation

 person_and_organization_item - EXTENSIBLE SELECT
          product
          product_definition
          product_definition_formation

 property_assignment_select - EXTENSIBLE SELECT
          part_view_definition

 versionable_item - EXTENSIBLE SELECT
          document_file
          shape_representation