<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eb5c1a62b99_-_lx-finished-envelope-craft-how-to-make-an-envelope-0412-xln.jpg>
<http://www.countryliving.com/diy-crafts/how-to/g1281/how-to-make-an-envelope/>