<https://tryanderrorandtry.com/%e3%83%9e%e3%83%aa%e3%82%aa%e3%83%83%e3%83%88#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tryanderrorandtry.com/%E3%83%9E%E3%83%AA%E3%82%AA%E3%83%83%E3%83%88>