Extensible select and enumeration types

and their elements in schema External_state_based_behaviour_model_arm taking into account BASED_ON types


 external_identification_item - EXTENSIBLE GENERIC_ENTITY SELECT
          File

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure

 state_definition_of_item - EXTENSIBLE GENERIC_ENTITY SELECT