<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://clv.h-cdn.co/assets/cm/15/09/54eb77909ce6e_-_carpet-cleaning-04-0114-de.jpg>
<http://www.countryliving.com/home-maintenance/cleaning/tips/a4966/10-carpet-cleaning-secrets-from-the-pros-popular-mechanics/>