<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/980x542/54eb887c8a302_-_square-pool-klwxyo-de.jpg>
<http://www.countryliving.com/gardening/g1748/cool-shaped-pools/>