Question: How many monarchical countries are there in Europe?
SPARQL:
PREFIX onto: <http://dbpedia.org/ontology/>
PREFIX yago: <http://dbpedia.org/class/yago/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT COUNT(DISTINCT ?uri)
WHERE 
{
	?uri rdf:type yago:EuropeanCountries .
        ?uri onto:governmentType ?govern .
        FILTER regex(?govern,'monarchy') .
}