Question: Which class achieved the highest revenue for the Town of Cary?
SPARQL:
 select ?result from <http://linkedspending.aksw.org/town_of_cary_revenues> { ?obs qb:dataSet ls:town_of_cary_revenues. ?obs lso:town_of_cary_revenues-Class ?result. ?obs lso:town_of_cary_revenues-amount ?amount. } order by desc(sum(xsd:decimal(?amount))) limit 1