Question: Who is the author of WikiLeaks?
SPARQL:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT ?uri ?string
WHERE 
{
        res:WikiLeaks onto:author ?uri .
        OPTIONAL {?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}