Extensible select and enumeration types

and their elements in schema PRODUCT_GROUP_MIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          product_group
          product_group_relationship

 date_and_time_item - EXTENSIBLE SELECT
          event_occurrence

 date_item - EXTENSIBLE SELECT
          event_occurrence

 effectivity_item - EXTENSIBLE SELECT
          product_group
          product_group_membership
          product_group_relationship

 identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          product
          product_definition_formation

 product_select - EXTENSIBLE GENERIC_ENTITY SELECT
          product
          product_concept
          product_definition_formation
          product_group