<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x160/54caefccc39e4_-_lawnmower-guide-00-0712-de.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g867/how-to-pick-the-right-mower-for-your-lawn/>