<http://schema.org/description>
"\u4EC0\u4E48\u65F6\u5019\u52A0\u4E2A\u4F2A\u6625\u83DC\u7684widget\u5427\u2026\u2026\u2026\u2026"^^<http://www.w3.org/2001/XMLSchema#string>
<https://catfan.me/bazhao/p696>