<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://edc.h-cdn.co/assets/cm/15/04/54c06b7493402_-_appliances-air-purifiers-half.jpg>
<http://www.elledecor.com/shopping/a3751/buying-guide-air-purifiers-a-16024/>