Question: What is the common citizenship between JSM Hopoer and Robert Valentine ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/J._S._M._Hooper> <http://dbpedia.org/ontology/citizenship> ?uri. <http://dbpedia.org/resource/Robert_Valentine_(composer)> <http://dbpedia.org/ontology/country> ?uri}