<http://schema.org/description>
"\u6211\u771F\u7684\u597D\u6000\u5FF5\u5750\u5728\u4F60\u524D\u9762\u7684\u90A3\u4E24\u4E2A\u661F\u671F\u03C0_\u03C0"^^<http://www.w3.org/2001/XMLSchema#string>
<https://catfan.me/arfinn/p35393>