<http://schema.org/headline>
"\u300C\u6709\u540D\u7A0E\u300D\u3068\u3044\u3046\u30D7\u30E9\u30A4\u30D0\u30B7\u30FC\u4FB5\u5BB3"^^<http://www.w3.org/2001/XMLSchema#string>
<http://nakaken88.com/2016/05/24/080853>