<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x552/54cabb1de67f5_-_okemo_snowgroomer_04_1210-xl-30421885.jpg>
<http://www.popularmechanics.com/adventure/sports/g461/riding-a-monster-snow-groomer/>