Question: What is the highest mountain in Australia?
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#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string 
WHERE {
	?uri rdf:type onto:Mountain .
        ?uri onto:locatedInArea res:Australia .
        ?uri onto:elevation ?elevation .
        OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
} 
ORDER BY DESC(?elevation) LIMIT 1