<https://a-ward.com/projects/%e5%92%96%e5%95%a1%e6%9c%b1%e5%88%a9%e9%9b%86%e5%9b%a2/?lang=zh-hans#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://a-ward.com/projects/%E5%92%96%E5%95%A1%E6%9C%B1%E5%88%A9%E9%9B%86%E5%9B%A2/?lang=zh-hans>