def test_locationNoBar3(self):
        xp = XPathQuery("/foo/bar3")
        self.assertEquals(xp.matches(self.e), 0)
Tells the UserAppServer to reserve the given app_id for a particular
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/words/test/test_xpath.py/XPathTest.test_locationNoBar3--crossover with--dataset/ETHPy150Open AppScale/appscale-tools/lib/user_app_client.py/UserAppClient.reserve_app_id