<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x322/54cabb1e29c63_-_okemo_snowgroomer_05_1210-xl-55627684.jpg>
<http://www.popularmechanics.com/adventure/sports/g461/riding-a-monster-snow-groomer/>