<https://otowota.com/archives/tag/%e3%83%aa%e3%83%88%e3%82%b0%e3%83%aa/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://otowota.com/archives/tag/%E3%83%AA%E3%83%88%E3%82%B0%E3%83%AA/>