<https://blog.ulifestyle.com.hk/article/gorei/4307635/\u8AA0\u5FC3\u7684\u8B77\u58EB-6>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.ulifestyle.com.hk/article/gorei/4307635/%E8%AA%A0%E5%BF%83%E7%9A%84%E8%AD%B7%E5%A3%AB-6>