Extensible select and enumeration types

and their elements in schema PRODUCT_AS_INDIVIDUAL_XIM taking into account BASED_ON types


 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          externally_defined_identification_assignment

 identification_item - EXTENSIBLE SELECT
          product_as_individual
          product_as_individual_version
          product_as_individual_view

 versionable_item - EXTENSIBLE SELECT