Question: Who developed the video game World of Warcraft?
SPARQL:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT ?uri ?string
WHERE 
{
	?subject rdf:type onto:Software .
      	?subject rdfs:label 'World of Warcraft'@en .
	?subject onto:developer ?uri . 
        OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') }
}