what is the protocol provider of the software which's genre is digital assets repository? 
Entity Entity
m.03nsxd m.03nnd7
Representational state transfer Open Archives Initiative Protocol for Metadata Harvesting
class class entity
computer.protocol_provider computer.software m.09msx3
computer.protocol_provider computer.software computer.software_genre
Protocol Provider Software Digital Assets Repository
none none none
computer.software.service_network computer.software_genre.software_in_genre
Protocols Provider Software In Genre
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.protocol_provider . 
?x1 :type.object.type :computer.software . 
VALUES ?x2 { :m.09msx3 } 
?x1 :computer.software.service_network ?x0 . 
?x2 :computer.software_genre.software_in_genre ?x1 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND computer.protocol_provider (JOIN (R computer.software.service_network) (JOIN (R computer.software_genre.software_in_genre) m.09msx3)))