Question: Who was Tom Hanks married to?
SPARQL query:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT ?uri ?string
WHERE 
{
      ?person rdfs:label 'Tom Hanks'@en .
      ?person prop:spouse ?string .
      OPTIONAL { ?uri rdfs:label ?string . }
}