<https://blog.ulifestyle.com.hk/article/gorei/4178873/\u5BEB\u6545\u4E8B>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.ulifestyle.com.hk/article/gorei/4178873/%E5%AF%AB%E6%95%85%E4%BA%8B>