<http://schema.org/keywords>
"\u307F\u305D\u30FB\u30A2\u30E1\u306A\u3069\u898B\u3064\u304B\u308B"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.asahi.com/articles/ASJ1Y3H0XJ1YOIPE008.html?ref=rss>