Question: What was the highest Washington DC employee salary in 2011?
SPARQL:
select max(xsd:decimal(?amount)) from <http://linkedspending.aksw.org/dc-city-salaries> { ?obs qb:dataSet ls:dc-city-salaries. ?obs lso:dc-city-salaries-amount ?amount. ?obs lso:refYear ?year. filter(year(?year)=2011). }