Extensible select and enumeration types

and their elements in schema Pdm_material_aspects_mim taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_file

 identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          document_file
          product
          product_definition_formation