<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/640x320/54cfd650045f7_-_oil-rig-0213-de.jpg>
<http://www.popularmechanics.com/science/energy/a8750/anatomy-of-an-offshore-oil-rig-15152665/>