Extensible select and enumeration types

and their elements in schema REQUIREMENT_ASSIGNMENT_MIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          product
          product_definition_formation

 requirement_assigned_item - EXTENSIBLE GENERIC_ENTITY SELECT

 requirement_satisfaction_item - EXTENSIBLE GENERIC_ENTITY SELECT
          requirement_assigned_item

 requirement_source_item - EXTENSIBLE GENERIC_ENTITY SELECT