<https://www.ctc.ac.uk/zh/%e8%af%be%e7%a8%8b%e9%a1%b9%e7%9b%ae/gcse%e8%af%be%e7%a8%8b/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.ctc.ac.uk/zh/%E8%AF%BE%E7%A8%8B%E9%A1%B9%E7%9B%AE/gcse%E8%AF%BE%E7%A8%8B/>