<http://schema.org/headline>
"Facebook\u3067\u77E5\u3089\u306A\u3044\u53CB\u9054\u3084\u3044\u3089\u306A\u3044\u30A2\u30D7\u30EA\u3092\u4E00\u62EC\u524A\u9664\u3059\u308B\u65B9\u6CD5"^^<http://www.w3.org/2001/XMLSchema#string>
<http://howcollect.jp/article/1419>