Question: What countries used Solidus as currency?
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:currency <http://dbpedia.org/resource/Solidus_(coin)> . ?uri rdf:type onto:Country}