Question: Name the driver who was at pole in 1997 Canadian Grand Prix and also 1994 Spanish Grand Prix ?
SPARQL:
 SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/1997_Canadian_Grand_Prix> <http://dbpedia.org/property/poleDriver> ?uri. <http://dbpedia.org/resource/1994_Spanish_Grand_Prix> <http://dbpedia.org/ontology/poleDriver> ?uri}