<https://oceanfree.com.hk/itp3100%e6%b0%b4%e6%80%a7%e7%84%a1%e6%a9%9f%e4%bf%9d%e6%ba%ab%e6%bc%86/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://oceanfree.com.hk/itp3100%E6%B0%B4%E6%80%A7%E7%84%A1%E6%A9%9F%E4%BF%9D%E6%BA%AB%E6%BC%86/>