<https://ronso.co.jp/#website>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ronso.co.jp/book/%E6%9F%84%E8%B0%B7%E8%A1%8C%E4%BA%BA-%E3%80%88%E4%B8%96%E7%95%8C%E5%90%8C%E6%99%82%E9%9D%A9%E5%91%BD%E3%80%89%E3%81%AE%E3%82%A8%E3%83%81%E3%82%AB/>