Extensible select and enumeration types

and their elements in schema SCHEME_XIM taking into account BASED_ON types


 action_items - EXTENSIBLE GENERIC_ENTITY SELECT

 action_method_items - EXTENSIBLE SELECT

 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT

 date_and_time_item - EXTENSIBLE SELECT
          event_occurrence

 date_item - EXTENSIBLE SELECT
          event_occurrence
          scheme_entry

 organization_item - EXTENSIBLE SELECT
          scheme
          scheme_entry

 person_and_organization_item - EXTENSIBLE SELECT

 time_interval_item - EXTENSIBLE SELECT