<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/640x450/54cab5bfb8ec4_-_ice_rink_04_1210-de-99419106.jpg>
<http://www.popularmechanics.com/home/outdoor-projects/how-to/a6307/how-to-build-a-backyard-ice-rink/>