Question: Which German cities have more than 250000 inhabitants?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string WHERE 
{
	{ ?uri rdf:type dbo:City . } UNION { ?uri rdf:type dbo:Town . }
        ?uri dbo:country res:Germany .
	?uri dbo:populationTotal ?population .
	FILTER ( ?population > 250000 ) 
        OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}