def negate(self):
        self.children = [self._new_instance(self.children, self.connector,
                not self.negated)]
        self.connector = self.default
Negate the sense of the root connector. This reorganises the children
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/utils/tree.py/Node.negate