Question: Give me all islands that belong to Japan.
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> 
PREFIX res: <http://dbpedia.org/resource/> 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
SELECT DISTINCT ?uri 
WHERE { 
        ?uri rdf:type onto:Island .  
        ?uri onto:country res:Japan . 
}