<http://schema.org/keywords>
"\u5186\u58F2\u308A\u30C9\u30EB\u8CB7\u3044\u306E\u52D5\u304D\u5E83\u304C\u308B"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.asahi.com/articles/ASJ2F1TM2J2FUHBI004.html>