<https://sl-journal.com/tag/%e3%82%8f%e3%81%8d%e3%81%8c%e6%b2%bb%e7%99%82#listItem>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://sl-journal.com/tag/%E3%82%8F%E3%81%8D%E3%81%8C%E6%B2%BB%E7%99%82>