<http://schema.org/headline>
"San Francisco International Airport official says 61 flights canceled so far due to weather, delays from 30 minutes to 2.5 hours - @NBCNews"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.breakingnews.com/item/2012/04/13/san-francisco-international-airport-official-says-61-flights-canceled/>