Question: Which movies starring Brad Pitt were directed by Guy Ritchie?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/> 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
SELECT DISTINCT ?uri 
WHERE {  
   ?uri rdf:type onto:Film . 
   ?uri onto:starring res:Brad_Pitt . 
   ?uri onto:director res:Guy_Ritchie . 
}