code: def get_label(self, lang=None):
          
          x = None
          if lang is None:
              for obj in self.graph.objects(self.asNode(), RDFS.label):
                  return obj
          for obj in self.graph.objects(self.asNode(), RDFS.label):
              x = obj
              if x.language == lang:
                  return x
          return x
docs: Return label for given lang or any default
  
          :param lang: Language to request
          :return: Label value
          :rtype: Literal