<http://schema.org/headline>
"June 18, 1928: Amelia Earhart flies across the Atlantic"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.heraldnet.com/article/20130618/BLOG55/130539969/1121/June-18-1928-Amelia-Earhart-flies-across-the-Atlantic>