Extensible select and enumeration types

and their elements in schema Specification_based_configuration_arm taking into account BASED_ON types


 configured_item_select - EXTENSIBLE GENERIC_ENTITY SELECT

 date_or_date_time_item - EXTENSIBLE SELECT

 effectivity_item - EXTENSIBLE SELECT
          Configuration

 groupable_item - EXTENSIBLE GENERIC_ENTITY SELECT

 identification_item - EXTENSIBLE SELECT
          Product_class

 measure_value - EXTENSIBLE SELECT
          any_number_value
          any_string_value
          length_measure
          plane_angle_measure