<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/768x516/54cab2682edf4_-_hammer_drill_03_1110-xl-12807906.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g455/who-needs-a-hammer-drill/>