<https://house-base.co.jp/press/column/knowledge/%e9%9b%bb%e6%b0%97%e4%bb%a3%e3%81%8c%e7%af%80%e7%b4%84%e3%81%a7%e3%81%8d%e3%82%8b%ef%bc%81%e7%9c%81%e3%82%a8%e3%83%8d%e5%ae%b6%e9%9b%bb%e3%81%ae%e3%80%8c%e9%81%b8%e3%81%b3%e6%96%b9%e3%80%8d%e3%81%a8/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://house-base.co.jp/press/column/knowledge/%E9%9B%BB%E6%B0%97%E4%BB%A3%E3%81%8C%E7%AF%80%E7%B4%84%E3%81%A7%E3%81%8D%E3%82%8B%EF%BC%81%E7%9C%81%E3%82%A8%E3%83%8D%E5%AE%B6%E9%9B%BB%E3%81%AE%E3%80%8C%E9%81%B8%E3%81%B3%E6%96%B9%E3%80%8D%E3%81%A8/>