Question: What is the highest mountain in Germany?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT ?uri ?string
WHERE 
{
	?uri rdf:type onto:Mountain .
        ?uri onto:elevation ?elevation .
        ?uri onto:locatedInArea ?area .
        FILTER (regex(?area,'Germany')) .
        OPTIONAL {?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
} ORDER BY DESC(?elevation) LIMIT 1