<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/640x480/54eb9910c640b_-_cave-living-room-after.jpg>
<http://www.countryliving.com/remodeling-renovation/home-makeovers/a5645/converted-cave-before-after-france/>