<http://schema.org/headline>
"\u7B2C4\u56DE\u3000Redis\u3092\u7528\u3044\u305F\u30A2\u30D7\u30EA\u30B1\u30FC\u30B7\u30E7\u30F3\u958B\u767A\uFF082\uFF09"^^<http://www.w3.org/2001/XMLSchema#string>
<http://gihyo.jp/dev/feature/01/redis/0004>