<http://schema.org/headline>
"\u5206\u6563Key-Value\u30B9\u30C8\u30A2\u300CRiak 1.0\u300D\u30EA\u30EA\u30FC\u30B9\uFF1A\u6FC3\u7E2E\u9084\u5143\u30AA\u30EC\u30F3\u30B8\u30CB\u30E5\u30FC\u30B9"^^<http://www.w3.org/2001/XMLSchema#string>
<http://gihyo.jp/dev/clip/01/orangenews/vol65/0002>