<http://schema.org/headline>
"Timeline: The battle to open U.S. skies to unarmed drones is heating up"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mercurynews.com/2013/04/07/timeline-the-battle-to-open-u-s-skies-to-unarmed-drones-is-heating-up/>