<https://www.naughty-boy.net/2021/12/12/%e5%86%99%e7%9c%9f%e3%81%ae%e7%b7%b4%e7%bf%92/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.naughty-boy.net/2021/12/12/%E5%86%99%E7%9C%9F%E3%81%AE%E7%B7%B4%E7%BF%92/>