<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x426/54cb05b22d216_-_cool-signs-04-0113-lgn.jpg>
<http://www.popularmechanics.com/military/g1074/10-sinister-signs-from-restricted-locations/>