<http://schema.org/keywords>
"\u30A6\u30A9\u30EB\u30BF\u30FC\u30FB\u30C1\u30E3\u30F3\u30C9\u30FC\u30CF"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/2016/01/20/adorable-cats-are-taking-over-bookstore-shelves_n_9024946.html>