<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://wdy.h-cdn.co/assets/cm/15/09/320x408/54ebdd41dc287_-_new-treehouses-book-phmpjc-tefe6v-lg.jpg>
<http://www.womansday.com/home/decorating/g1567/treehouses-popular-mechanics/>