docs: def add_target_id(self,this_id):
          """
          Adds a new target to the span with the specified id
          @type this_id: string
          @param this_id: the id of the new target
          """
          new_target = Ctarget()
          new_target.set_id(this_id)
          self.node.append(new_target.get_node())