<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54ca6aa1e489b_-_pressure-washing-01-0711-mdn.jpg>
<http://www.popularmechanics.com/home/outdoor-projects/how-to/a3233/how-to-pressure-wash-your-house/>