<http://schema.org/keywords>
"\u6771\u4EAC\u30AA\u30EA\u30F3\u30D4\u30C3\u30AF"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/shun-otokita/tokyo-olympic-improvement_b_12302884.html>