xs.addObserver("/iq/pubsub/create", self.result_create_node)
xs.addObserver("/iq/pubsub/delete", self.result_delete_node)
xs.addObserver("/iq/query[@xmlns='http://jabber.org/protocol/disco#items']", self.result_discover)
xs.addObserver("/iq/pubsub/subscription[@subscription='subscribed']", self.result_subscribe_to_node)
xs.addObserver("/iq/pubsub/create", self.result_create_node)
xs.addObserver("/iq/pubsub/delete", self.result_delete_node)
xs.addObserver("/iq/query[@xmlns='http://jabber.org/protocol/disco#items']", self.result_discover)
xs.addObserver("/iq/pubsub/subscription[@subscription='subscribed']", self.result_subscribe_to_node)