Extensible select and enumeration types

and their elements in schema GENERAL_MODEL_PARAMETER_MIM taking into account BASED_ON types


 characterized_product_definition - EXTENSIBLE SELECT
          product_definition
          product_definition_relationship

 classification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          constrained_general_parameter_relationship
          general_model_parameter
          parameter_value_representation_item

 groupable_item - EXTENSIBLE GENERIC_ENTITY SELECT
          parameter_value_representation_item
          parameter_value_select

 name_item - EXTENSIBLE GENERIC_ENTITY SELECT
          external_class_library

 parameter_value_select - EXTENSIBLE GENERIC_ENTITY SELECT
          generic_expression
          measure_with_unit