what is the {publication date} for {Android} has {software version} as {6.0} ?
When Android version 6.0 was launched ?
When was Android version 6.0 published?
SELECT ?l WHERE { resource:Android property:software_version_identifier ?t . FILTER ( CONTAINS ( ?a , '6.0' ) ) . ?t property:software_version_identifier ?a . ?t property:publication_date ?l }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q94> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P348> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <6.0> .
?statement <http://www.wikidata.org/entity/P577> ?value. 
} 

SELECT ?value WHERE { wd:Q94 p:P348 ?s . ?s ps:P348 ?x filter(contains(?x , '6.0')) . ?s pq:P577 ?value}