<https://genesis-surgery.com/%e8%9f%b9%e8%b6%b3%e8%85%ab%e5%86%b7%e5%87%8d%e6%b2%bb%e7%99%82-vs-%e5%88%87%e9%99%a4%e6%89%8b%e8%a1%93/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://genesis-surgery.com/%E8%9F%B9%E8%B6%B3%E8%85%AB%E5%86%B7%E5%87%8D%E6%B2%BB%E7%99%82-vs-%E5%88%87%E9%99%A4%E6%89%8B%E8%A1%93/>