<http://schema.org/alternativeHeadline>
"Google I/O 2014 registration dates pushed back by a week \u2014 now open April 15-18"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2014/04/08/google-io-2014-registration-dates-pushed-back-week-now-open-april-15-18/>