Adds new targets to the span that are defined in a list
        @type list_targs: list
        @param list_targs: list of Ctargets

def create_from_targets(self,list_targs):
        """
        Adds new targets to the span that are defined in a list
        @type list_targs: list
        @param list_targs: list of Ctargets
        """
        for this_target in list_targs:
            self.node.append(this_target.get_node())