Extensible select and enumeration types

and their elements in schema PARAMETER_VALUE_SPECIFICATION_MIM taking into account BASED_ON types


 groupable_item - EXTENSIBLE GENERIC_ENTITY SELECT
          generic_expression
          named_variable_semantics

 name_item - EXTENSIBLE GENERIC_ENTITY SELECT
          named_variable_semantics

 parameter_value_select - EXTENSIBLE GENERIC_ENTITY SELECT
          generic_expression
          measure_with_unit