<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://hbu.h-cdn.co/assets/cm/15/04/480x552/54c0b6733d02c_-_06-hbx-corkscrew-staircase-ortego-0808-xln.jpg>
<http://www.housebeautiful.com/room-decorating/entryway-ideas/tips/g1380/unique-staircases/>