Question: Give me all cosmonauts.
SPARQL:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
PREFIX dbo: <http://dbpedia.org/ontology/> 
PREFIX res: <http://dbpedia.org/resource/> 
SELECT DISTINCT ?uri 
WHERE { 
        ?uri rdf:type dbo:Astronaut . 
      { ?uri dbo:nationality res:Russia . } 
      UNION 
      { ?uri dbo:nationality res:Soviet_Union . } 
}