william m. hoffman is the librettist of what opera?
Entity
m.06hccn
The Ghosts of Versailles
class entity
opera.opera m.0263n3v
opera.opera opera.librettist
Opera William M. Hoffman
none none
opera.opera.librettist
Librettist
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 :opera.opera . 
VALUES ?x1 { :m.0263n3v } 
?x0 :opera.opera.librettist ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND opera.opera (JOIN opera.opera.librettist m.0263n3v))