Extensible select and enumeration types

and their elements in schema RISK_DEFINITION_MIM taking into account BASED_ON types


 action_items - EXTENSIBLE GENERIC_ENTITY SELECT

 action_method_items - EXTENSIBLE SELECT
          risk_perception

 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          representation

 risk_impact_item - EXTENSIBLE GENERIC_ENTITY SELECT
          product
          product_definition_formation

 risk_perception_source_item - EXTENSIBLE GENERIC_ENTITY SELECT
          action
          action_method
          product