<http://schema.org/headline>
"\u300C\u308F\u304B\u308A\u3084\u3059\u3044\u8AAC\u660E\u300D\u3068\u300C\u30A6\u30BD\u300D"^^<http://www.w3.org/2001/XMLSchema#string>
<http://nakaken88.com/2016/06/23/080816>