<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x552/54cab267b3103_-_hammer_drill_02_1110-xl-27797135.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g455/who-needs-a-hammer-drill/>