Question: What is the bridge with the longest span?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?uri 
WHERE {
        ?uri rdf:type dbo:Bridge .
        ?uri dbo:mainspan ?s . 
} 
ORDER BY DESC(?s) 
OFFSET 0 LIMIT 1