<https://furniture.markteaching.com/10%e5%a4%a7%e6%9c%80%e5%a4%af%e6%b2%99%e7%99%bc-%e5%93%81%e7%89%8c-%e5%93%81%e7%94%9f%e6%b4%bb%e6%8e%a8%e8%96%a6/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://furniture.markteaching.com/10%E5%A4%A7%E6%9C%80%E5%A4%AF%E6%B2%99%E7%99%BC-%E5%93%81%E7%89%8C-%E5%93%81%E7%94%9F%E6%B4%BB%E6%8E%A8%E8%96%A6/>