<http://schema.org/headline>
"Del Potro upsets Federer to win U.S. Open"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Sports_News/2009/09/14/Del-Potro-upsets-Federer-to-win-US-Open/UPI-61341252976694/>