Question: Which countries have more than ten caves?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
SELECT DISTINCT ?uri 
WHERE { 
        ?uri rdf:type onto:Country . ?cave rdf:type onto:Cave . { ?cave onto:location ?uri . } UNION { ?cave onto:location ?loc . ?loc onto:country ?uri . } } GROUP BY ?uri HAVING(COUNT(?cave) > 10)