<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cacb71398b4_-_future-hammock-0811-de.jpg>
<http://www.popularmechanics.com/home/lawn-garden/how-to/a6822/how-to-build-a-three-person-hammock/>