<https://thraki.org/2021/02/28/%e9%ba%bb%e5%a9%86%e8%b1%86%e8%85%90-%e5%ad%90%e4%be%9b-%e3%83%ac%e3%82%b7%e3%83%94-%e9%87%8e%e8%8f%9c/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://thraki.org/2021/02/28/%E9%BA%BB%E5%A9%86%E8%B1%86%E8%85%90-%E5%AD%90%E4%BE%9B-%E3%83%AC%E3%82%B7%E3%83%94-%E9%87%8E%E8%8F%9C/>