<https://simplecampwithdogs.com/archives/%e3%80%90%e6%9d%be%e6%9c%ac%e8%a6%b3%e5%85%89%e3%81%a8%e6%b5%85%e9%96%93%e6%b8%a9%e6%b3%89-%e9%95%b7%e9%87%8e%e7%9c%8c%e3%80%91%e3%81%9d%e3%81%86%e3%81%a0-%e6%9d%be%e6%9c%ac%e3%81%b8%e8%a1%8c-2.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://simplecampwithdogs.com/archives/%E3%80%90%E6%9D%BE%E6%9C%AC%E8%A6%B3%E5%85%89%E3%81%A8%E6%B5%85%E9%96%93%E6%B8%A9%E6%B3%89-%E9%95%B7%E9%87%8E%E7%9C%8C%E3%80%91%E3%81%9D%E3%81%86%E3%81%A0-%E6%9D%BE%E6%9C%AC%E3%81%B8%E8%A1%8C-2.html>