<http://schema.org/headline>
"2/8\u958B\u50AC\u300CHadoop / Spark Conference Japan 2016\u300D\u30D7\u30ED\u30B0\u30E9\u30E0\u3068\u898B\u3069\u3053\u308D\u306F\uFF1F\uFF1A\u30A4\u30F3\u30D5\u30A9\u30E1\u30FC\u30B7\u30E7\u30F3"^^<http://www.w3.org/2001/XMLSchema#string>
<http://gihyo.jp/news/info/2016/01/2801>