<https://bravel.yas.com.hk/tag/%e6%a4%8d%e7%89%a9%e5%92%96%e5%95%a1%e5%bb%b3/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://bravel.yas.com.hk/tag/%E6%A4%8D%E7%89%A9%E5%92%96%E5%95%A1%E5%BB%B3/>