<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x240/54cabb1d3dfc6_-_okemo_snowgroomer_01_1210-xl.jpg>
<http://www.popularmechanics.com/adventure/sports/g461/riding-a-monster-snow-groomer/>