Question: How many races have the horses bred by Jacques Van't Hart participated in?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/breeder> <http://dbpedia.org/resource/Jacques_Van't_Hart> . ?x <http://dbpedia.org/property/race> ?uri  . }
Answer: There are [8] races of the horses whose breeder is Jacques Van't Hart.