Question: When was DBpedia released?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?date
WHERE 
{
	?website rdf:type onto:Software .
        ?website onto:releaseDate ?date .
        ?website rdfs:label 'DBpedia'@en   
}