<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x360/54cb05b1539dd_-_cool-signs-02-0113-de.jpg>
<http://www.popularmechanics.com/military/g1074/10-sinister-signs-from-restricted-locations/>