<http://schema.org/headline>
"\u65E5\u672C\u8A9E\u5165\u529B\u304C\u304A\u304B\u3057\u3044\uFF1F"^^<http://www.w3.org/2001/XMLSchema#string>
<http://trendy.nikkeibp.co.jp/article/qa/trouble/20031016/106263/>