<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x240/54cb1fd17db51_-_axe-comparison-05-1113-de.jpg>
<http://www.popularmechanics.com/home/tools/reviews/g1354/4-tough-axes-field-tested/>