<https://areaplaning.com/archives/news/%e3%80%8e%e5%88%9d%e6%9c%9f%e8%b2%bb%e7%94%a8%e5%ae%8c%e5%85%a80%e5%86%86%e3%80%8f%e3%80%90%e3%83%a1%e3%82%be%e3%83%b3%e3%82%af%e3%83%ac%e3%83%a2%e3%83%8a%e3%80%91%e8%b3%83%e6%96%9922000%e5%86%86-2/img_5220>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://areaplaning.com/archives/news/%E3%80%8E%E5%88%9D%E6%9C%9F%E8%B2%BB%E7%94%A8%E5%AE%8C%E5%85%A80%E5%86%86%E3%80%8F%E3%80%90%E3%83%A1%E3%82%BE%E3%83%B3%E3%82%AF%E3%83%AC%E3%83%A2%E3%83%8A%E3%80%91%E8%B3%83%E6%96%9922000%E5%86%86-2/img_5220>