<http://schema.org/headline>
"\u7B2C4\u56DE\u3000\u72EC\u81EA\u30D6\u30ED\u30C3\u30AF\u306E\u30A4\u30F3\u30B9\u30C8\u30FC\u30EB"^^<http://www.w3.org/2001/XMLSchema#string>
<http://gihyo.jp/dev/serial/01/moodle/0004>