docs: def are_items_sequential(self):
          """Tests if the items or parts in this assessment are taken sequentially.
  
          return: (boolean) - ``true`` if the items are taken
                  sequentially, ``false`` if the items can be skipped and
                  revisited
          *compliance: mandatory -- This method must be implemented.*
  
          """
          if self._my_map['itemsSequential'] is None:
              return self.get_assessment().are_items_sequential()
          return bool(self._my_map['itemsSequential'])