<https://www.matsuoka-architects.com/single-post/2009/05/31/\u56DE\u7B54>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.matsuoka-architects.com/single-post/2009/05/31/%E5%9B%9E%E7%AD%94>