Question: Which ships were called after Benjamin Franklin?
SPARQL query:
PREFIX res:  <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?uri ?string WHERE 
{
        ?uri prop:shipNamesake res:Benjamin_Franklin .
        OPTIONAL { ?uri rdfs:label ?string. FILTER (lang(?string) = 'en') }
}