what is the parent company of riga autobus factory?
Entity
m.0j6ng4r
RAF
class entity
automotive.make m.015353
automotive.make automotive.company
Automobile Make Riga Autobus Factory
none none
automotive.make.parent_company
Parent Company
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 :automotive.make . 
VALUES ?x1 { :m.015353 } 
?x0 :automotive.make.parent_company ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND automotive.make (JOIN automotive.make.parent_company m.015353))