<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/480x320/54cb1c5566299_-_solar-tech-05-1013-de.jpg>
<http://www.popularmechanics.com/science/green-tech/g1311/12-clever-ideas-for-a-better-cleaner-water-pump/>