Question: Which city has the most inhabitants?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> 
PREFIX res: <http://dbpedia.org/resource/> 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
SELECT DISTINCT ?uri
WHERE { 
         ?uri rdf:type onto:City . 
         ?uri onto:populationTotal ?pop . 
}
ORDER BY DESC(?pop)
OFFSET 0 LIMIT 1