<http://schema.org/alternativeHeadline>
"Apple announces WWDC 2013 for June 10-14th to talk future OS X and iOS, tickets on sale April 25th,10am PT"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apple/2013/04/24/apple-announces-wwdc-2013-for/>