Question: How many films did Leonardo DiCaprio star in?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT COUNT(?film)
WHERE 
{
	?film rdf:type onto:Film .
        ?film onto:starring ?actors .
        ?actors foaf:name 'Leonardo DiCaprio'@en .
}