Extensible select and enumeration types

and their elements in schema CONDUCTIVITY_MATERIAL_ASPECTS_XIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          material_designation

 material_item_select - EXTENSIBLE GENERIC_ENTITY SELECT
          part_view_definition

 property_assignment_select - EXTENSIBLE SELECT