<http://schema.org/keywords>
"COPPER, free trial, GOLD, LEAD, NatGas, NICKEL, NIFTY, SILVER, ZINC"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mcxcontrol.com/2015/03/02/free-trial-type-free-tips-sms-09724034939-09724034979-2/>