<http://schema.org/keywords>
"\u77ED\u6642\u9593\u52B4\u50CD\u8005 \u539A\u751F\u5E74\u91D1"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/2013/12/18/pension-arrears_n_4463801.html>