<https://www.hfhd.org/post/\u8C6C\u4ED4\uFF08\u7537-4-\u6B72-\u60A3\u6709\u5FC3\u7D72\u87F2\uFF09>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.hfhd.org/post/%E8%B1%AC%E4%BB%94%EF%BC%88%E7%94%B7-4-%E6%AD%B2-%E6%82%A3%E6%9C%89%E5%BF%83%E7%B5%B2%E8%9F%B2%EF%BC%89>