Question: Which actors were born in Germany?
SPARQL query:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX res:  <http://dbpedia.org/resource/>
PREFIX yago: <http://dbpedia.org/class/yago/>
SELECT DISTINCT ?uri ?string
WHERE
{
  ?uri rdf:type onto:Actor .
  {   
      ?uri onto:birthPlace res:Germany .
  }
  UNION 
  {
      ?uri onto:birthPlace ?city .
      ?city rdf:type yago:StatesOfGermany . 
  }
  OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') }
}