Question: How big is the earth's diameter?
SPARQL:
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX res: <http://dbpedia.org/resource/> PREFIX dbo: <http://dbpedia.org/ontology/> select distinct (xsd:double(?radius)*2 AS ?diameter) where { res:Earth dbo:meanRadius ?radius . }