Extensible select and enumeration types

and their elements in schema PLIB_CLASS_REFERENCE_MIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          externally_defined_class

 name_item - EXTENSIBLE GENERIC_ENTITY SELECT
          external_class_library

 organization_item - EXTENSIBLE SELECT
          class

 person_and_organization_item - EXTENSIBLE SELECT