<http://schema.org/headline>
"\u30D6\u30ED\u30B0\u306B\u30B3\u30E1\u30F3\u30C8\u6A5F\u80FD\u306F\u3044\u3089\u306A\u3044"^^<http://www.w3.org/2001/XMLSchema#string>
<http://nakaken88.com/2015/10/14/080811>