<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caadd107f69_-_rain_barrel1_0810-sm.jpg>
<http://www.popularmechanics.com/science/green-tech/a6100/dos-and-donts-of-rain-barrel-use/>