 TYPE
    fdt$change_variable_key = (fdc$error_display,
      fdc$output_format, fdc$input_format, fdc$io_mode,
      fdc$terminal_user_entry, fdc$variable_length, fdc$add_valid_real_range,
      fdc$delete_valid_real_range, fdc$add_valid_integer_range,
      fdc$delete_valid_integer_range, fdc$add_valid_string,
      fdc$delete_valid_string, fdc$variable_help, fdc$variable_error,
      fdc$add_var_comment, fdc$delete_var_comments, fdc$unused_variable_entry,
      fdc$new_variable_name, fdc$process_as_event, fdc$unknown_entry_character,
      fdc$string_compare_rules,fdc$program_data_type,
      fdc$cobol_display_clause, fdc$cobol_program_clause);
