<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/480x310/54cfb92b97736_-_new-orleans-levee-04-0807-lgn.jpg>
<http://www.popularmechanics.com/science/environment/g72/4221039/>