<http://schema.org/keywords>
"\u30CE\u30FC\u30D9\u30EB\u5E73\u548C\u8CDE \u30DE\u30E9\u30E9"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.huffingtonpost.jp/2014/10/10/malala-nobel_n_5963770.html>