<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/480x318/54cfb92bcc086_-_new-orleans-levee-02-0807-lgn.jpg>
<http://www.popularmechanics.com/science/environment/g72/4221039/>