Question: Which people were born in Heraklion?
SPARQL:
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 yago: <http://dbpedia.org/class/yago/>
SELECT DISTINCT ?uri ?string
WHERE 
{
      ?uri rdf:type onto:Person .
      ?uri onto:birthPlace ?city .
      ?city rdfs:label 'Heraklion'@en
      OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') }
}