Question: Show me everyone who was born on Halloween.
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
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:Person .
      { ?uri onto:birthDate ?date . }
      UNION
      { ?uri prop:birthDate ?date . }
        res:Halloween prop:date ?date . 
}