<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eaef9aed9d0_-_spring04_rockhaven_pln2-de-48494329.gif>
<http://www.countryliving.com/gardening/garden-ideas/a2744/design-rock-haven-0404/>