<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x320/54cb3b9f7273d_-_truckers-hitch-0614-de.jpg>
<http://www.popularmechanics.com/home/how-to/a10704/learn-to-tie-a-truckers-hitch-the-knot-youll-use-all-summer-16908244/>