<https://www.roots-okayama.com/post/\u5CA1\u5C71\uFF11\u756A\u306E\u9AD8\u984D\u8CB7\u53D6\u30FB\u55B6\u696D\u65E5\u7A0B-1>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.roots-okayama.com/post/%E5%B2%A1%E5%B1%B1%EF%BC%91%E7%95%AA%E3%81%AE%E9%AB%98%E9%A1%8D%E8%B2%B7%E5%8F%96%E3%83%BB%E5%96%B6%E6%A5%AD%E6%97%A5%E7%A8%8B-1>