<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54c87aad2683f_-_horseshoes-illo-0707.gif>
<http://www.popularmechanics.com/home/lawn-garden/how-to/a1770/4218238/>