SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/capital> <http://dbpedia.org/resource/Lusaka> . ?uri <http://dbpedia.org/ontology/sourceCountry> ?x . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Name the rivers whose source country's capital is Lusaka?
SELECT DISTINCT ?s WHERE { ?s property:source_country ?v . ?s rdf:type ontology:River . ?v property:capital resource:Lusaka }
Luvua River, Kafue River, Sakeji River, Zambezi
The rivers whose source country's capital is Lusaka are [Luvua River, Kafue River, Sakeji River, Zambezi].
Rivers, the capital of which is Lusaka [Luvua River, Kafue River, Sakeji River, Zambezi River].
The rivers whose source country's capital is  the city are [Luvua River, Kafue River, Sakeji River, Zambezi].
Rivers, the capital of which is the city [the Luvua River, the Kafue River, the Sakeji River, the Zambezi River].