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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://eternallight-spica.hatenablog.com/archive/category/%E3%81%B5%E3%82%8F%E3%81%A3%E3%81%A8%E3%83%A1%E3%83%83%E3%82%BB%E3%83%BC%E3%82%B8>