<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://hbu.h-cdn.co/assets/cm/15/04/640x430/54c0b6736f8bc_-_07-hbx-light-and-dark-wood-staircase-mcalpine-0410-xln.jpg>
<http://www.housebeautiful.com/room-decorating/entryway-ideas/tips/g1380/unique-staircases/>