<http://schema.org/alternativeHeadline>
"Relatives of the 1,517 people who died when the Titanic sank held a minute's silence on Tuesday at the spot where the liner was launched a century ago."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/stories/titanic-centenary-marked-by-descendants>