code: def tag_timexes(self):
          
          if not self.is_tagged(ANALYSIS):
              self.tag_analysis()
          if not self.is_tagged(TIMEXES):
              if self.__timex_tagger is None:
                  self.__timex_tagger = load_default_timex_tagger()
              self.__timex_tagger.tag_document(self, **self.__kwargs)
          return self
docs: Create ``timexes`` layer.
          Depends on morphological analysis data in ``words`` layer
          and tags it automatically, if it is not present.