name the airline hub which includes xi'an xiguan airport.
Entity
m.06c69v
Civil Aviation Administration of China
class entity
aviation.airline m.06zncxk
aviation.airline aviation.airport
Airline Xi'an Xiguan Airport
none none
aviation.airline.hubs
Hubs
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :aviation.airline . 
VALUES ?x1 { :m.06zncxk } 
?x0 :aviation.airline.hubs ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND aviation.airline (JOIN aviation.airline.hubs m.06zncxk))