Question: What river ends in Indian Ocean and also starts somewhere in Zambia?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE {?uri onto:riverMouth <http://dbpedia.org/resource/Indian_Ocean> . ?uri onto:sourceCountry <http://dbpedia.org/resource/Zambia>  . ?uri rdf:type onto:River}