<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/980x1170/54eb6948d0cde_-_04-family-fun-stairway-0514-s2.jpg>
<http://www.countryliving.com/home-design/decorating-ideas/g1498/staircase-ideas/>