<https://tur-quoise.com>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tur-quoise.com/blogs/12%E6%9C%88%E7%89%B9%E9%9B%86%E3%83%9A%E3%83%BC%E3%82%B8/%E3%81%8A%E5%AE%B6%E3%81%A7%E7%B0%A1%E5%8D%98-%E3%82%86%E3%81%B0%E3%82%A2%E3%83%AC%E3%83%B3%E3%82%B8%E3%83%AC%E3%82%B7%E3%83%94>