Extensible select and enumeration types

and their elements in schema RISK_SCHEMA taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 risk_impact_item - EXTENSIBLE GENERIC_ENTITY SELECT
          product
          product_definition_formation

 risk_perception_source_item - EXTENSIBLE GENERIC_ENTITY SELECT
          action
          action_method
          product