what platform of computing uses the file format extended from postscript?
Entity Entity
m.055yr m.027lnzs
OS X iPhone
class class entity
computer.computing_platform computer.file_format m.0j_9zm7
computer.computing_platform computer.file_format computer.file_format
Computing Platform File Format PostScript
none none none
computer.file_format.used_on computer.file_format.extended_from
Used On Extended From
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 :computer.computing_platform . 
?x1 :type.object.type :computer.file_format . 
VALUES ?x2 { :m.0j_9zm7 } 
?x1 :computer.file_format.used_on ?x0 . 
?x1 :computer.file_format.extended_from ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND computer.computing_platform (JOIN (R computer.file_format.used_on) (JOIN computer.file_format.extended_from m.0j_9zm7)))