Extensible select and enumeration types

and their elements in schema PHYSICAL_BREAKDOWN_XIM taking into account BASED_ON types


 breakdown_item - EXTENSIBLE SELECT
          breakdown_element_definition
          breakdown_element_usage_armx

 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 product_definition_or_breakdown_element_usage - EXTENSIBLE GENERIC_ENTITY SELECT
          product_definition
          product_definition_usage

 product_definition_or_product_definition_relationship - EXTENSIBLE GENERIC_ENTITY SELECT
          product_definition
          product_definition_usage

 product_item - EXTENSIBLE SELECT
          product_definition_usage
          product_view_definition

 property_assignment_select - EXTENSIBLE SELECT
          breakdown_element_realization
          breakdown_element_usage_armx