<https://specialdreamspace.com/%e3%82%88%e3%81%86%e3%81%93%e3%81%9d%e5%8d%a0%e3%81%84%e5%a4%a2%e7%a9%ba%e9%96%93%e3%81%b8/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://specialdreamspace.com/%E3%82%88%E3%81%86%E3%81%93%E3%81%9D%E5%8D%A0%E3%81%84%E5%A4%A2%E7%A9%BA%E9%96%93%E3%81%B8/>