Question: Who was the leader of Curitiba in 2013?
Paraphrase: In 2013 who was in charge of Curitibar?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q4361 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2013')) }