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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://webmarumasu.com/blogs/blog/2022-10-2%E5%96%84%E5%85%89%E5%AF%BA%E8%A1%A8%E5%8F%82%E9%81%93%E7%A7%8B%E3%81%BE%E3%81%A4%E3%82%8A>