<http://schema.org/keywords>
"\u30B0\u30EA\u30FC\u30F3\u30D4\u30FC\u30B9 \u30DE\u30C1\u30E5\u30D4\u30C1\u30E5"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/2014/12/12/greenpeace_n_6314012.html>