Extensible select and enumeration types

and their elements in schema PRODUCT_STRUCTURE_MIM taking into account BASED_ON types


 document_reference_item - EXTENSIBLE SELECT
          product
          product_definition
          product_definition_formation

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_file
          product_definition

 identification_item - EXTENSIBLE SELECT
          document_file
          shape_representation

 organization_item - EXTENSIBLE SELECT
          product
          product_definition
          product_definition_formation

 person_and_organization_item - EXTENSIBLE SELECT
          product
          product_definition
          product_definition_formation

 versionable_item - EXTENSIBLE SELECT
          document_file
          shape_representation