<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://edc.h-cdn.co/assets/cm/15/04/480x600/54c164401458a_-_3_1370978900_barnaba_fornasetti_edc_01_13_06_lgn.jpg>
<http://www.elledecor.com/design-decorate/room-ideas/g511/unique-staircase-design/>