<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x240/54cb1fdcb12a3_-_jigsaw-tips-01-1113-lgn.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g1334/6-tips-to-get-the-most-from-your-jigsaw/>