code: def add_predicateAnchor(self,my_predAnch):
          
          if self.temporalRelations_layer is None:
              self.temporalRelations_layer = CtemporalRelations()
              self.root.append(self.temporalRelations_layer.get_node())
          self.temporalRelations_layer.add_predicateAnchor(my_predAnch)
docs: Adds a predAnch to the temporalRelations layer
          @type my_predAnch: L{CpredicateAnchor}
          @param my_predAnch: predicateAnchor object