<http://schema.org/headline>
"Twitter\u3067\u30D5\u30A9\u30ED\u30EF\u30FC\u3092\uFF11\u65E550\u4EBA\u5897\u3084\u3059\u65B9\u6CD5"^^<http://www.w3.org/2001/XMLSchema#string>
<http://howcollect.jp/article/354>