<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/320x240/54cb05b3c3cc3_-_cool-signs-08-0113-de.jpg>
<http://www.popularmechanics.com/military/g1074/10-sinister-signs-from-restricted-locations/>