<https://www.agf-design.com/post/\u304A\u8336\u4E8B\u696D\u306B\u3064\u3044\u3066\u306E\u304A\u77E5\u3089\u305B>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.agf-design.com/post/%E3%81%8A%E8%8C%B6%E4%BA%8B%E6%A5%AD%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6%E3%81%AE%E3%81%8A%E7%9F%A5%E3%82%89%E3%81%9B>