SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/leader> <http://dbpedia.org/resource/David_Johnston> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Country>}
Which country's leader is David Johnston?
SELECT DISTINCT ?n WHERE { ?n rdf:type ontology:Country . ?n property:leader resource:David_Johnston }
Canada
[Canada] is the country with David Johnston as leader.
[Canada] is a country with leader named David Johnston.
[Canada] is the country whose leader is him.
[Canada] is the country he leads.
[Canada] is the country whose leader is the person.
Country the person leads is [Canada].