What is the {country} for {participant} of {Battle of France}
What nations taken part within the Fight of France?
What countries participated in the Battle of France?
SELECT DISTINCT ?k WHERE { resource:Battle_of_France property:participant ?k . ?k rdf:type ontology:country }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q151340> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P710> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q6256> } 
 select distinct ?obj where { wd:Q151340 wdt:P710 ?obj . ?obj wdt:P31 wd:Q6256 } 
Kingdom of the Netherlands Canada United Kingdom