Extensible select and enumeration types

and their elements in schema GENERIC_PRODUCT_OCCURRENCE_XIM taking into account BASED_ON types


 extended_value_with_unit - EXTENSIBLE SELECT
          measure_with_unit
          value_limit
          value_range

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          external_source
          externally_defined_class
          externally_defined_general_property
          externally_defined_identification_assignment

 externally_versioned_item - EXTENSIBLE GENERIC_ENTITY SELECT
          externally_defined_general_property

 groupable_item - EXTENSIBLE GENERIC_ENTITY SELECT
          package_product_concept_feature
          product_concept_feature

 identification_item - EXTENSIBLE SELECT
          product_class
          product_concept_feature
          product_identification

 name_item - EXTENSIBLE GENERIC_ENTITY SELECT
          external_class_library

 organization_item - EXTENSIBLE SELECT
          class

 person_and_organization_item - EXTENSIBLE SELECT

 versionable_item - EXTENSIBLE SELECT
          product_class
          product_concept_feature
          product_identification