<http://schema.org/headline>
"Nigeria's Boko Haram threatens to sell schoolgirls on market"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.thestar.com.my/News/World/2014/05/06/Nigerias-Boko-Haram-threatens-to-sell-schoolgirls-on-market/>