Question: Give me a list of all American inventions.
SPARQL:
PREFIX yago: <http://dbpedia.org/class/yago/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string WHERE 
{
	?uri rdf:type yago:AmericanInventions .
	OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}