Adds a new target to the span with the specified id
        @type this_id: string
        @param this_id: the id of the new target

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())