<https://laudese.jp/archives/shi-tag/%e3%82%af%e3%83%a9%e3%82%b7%e3%83%83%e3%82%af>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://laudese.jp/archives/shi-tag/%E3%82%AF%E3%83%A9%E3%82%B7%E3%83%83%E3%82%AF>