Question: Which rivers flow into a German lake?
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:River .
        ?x onto:inflow ?uri .
        ?x rdf:type onto:Lake . 
        ?x onto:country res:Germany .
}