<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://hbu.h-cdn.co/assets/cm/15/04/980x551/54c098733e3e0_-_04-hbx-hang-pictures-over-night-stand-0207-s2.jpg>
<http://www.housebeautiful.com/home-remodeling/interior-designers/how-to/g1328/picture-hanging-tips/>