<http://schema.org/keywords>
"\u4E16\u754C\u7684\u306A\u8CC7\u6E90\u5B89\u3067\u640D\u5931\u81A8\u3089\u3080"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.asahi.com/articles/ASJ3S5RP2J3SULFA020.html?ref=rss>