<http://schema.org/headline>
"\u540C\u3058\u30E1\u30FC\u30EB\u304C2\u901A\u5C4A\u304F\u539F\u56E0\u306F\uFF1F"^^<http://www.w3.org/2001/XMLSchema#string>
<http://trendy.nikkeibp.co.jp/article/qa/internet/20031031/106402/>