<http://schema.org/keywords>
"\u30C7\u30B8\u30BF\u30EB\u30C7\u30C8\u30C3\u30AF\u30B9"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/mindful-leadership-institute/retreat_b_9755340.html>