<https://tsugitopi.com/archives/199/e19%e3%82%b5%e3%83%a0%e3%83%8d-100#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tsugitopi.com/archives/199/e19%E3%82%B5%E3%83%A0%E3%83%8D-100>