<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eb694cb9693_-_a-life-more-ordinary-staircase-1112-xln.jpg>
<http://www.countryliving.com/home-design/decorating-ideas/g1498/staircase-ideas/>