<http://schema.org/keywords>
"ALUMINIUM, COPPER, free trial, GOLD, LEAD, SILVER, ZINC"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mcxcontrol.com/2015/03/15/first-earn-then-pay-free-trial-send-sms-crudec-to-92200-92200-45/>