<http://schema.org/keywords>
"\u30A2\u30C8\u30E9\u30AF\u30B7\u30E7\u30F3 \u884C\u5217\u56DE\u907F"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/2013/06/09/disney-underground-tour_n_3410303.html>