<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/06/54cfbbe9d5a09_-_canon-450d-470-1208-de.jpg>
<http://www.popularmechanics.com/technology/gadgets/how-to/a3768/4293533/>