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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://yuuki-violin.com/%E8%87%AA%E8%BB%A2%E8%BB%8A/%E3%82%AF%E3%83%AD%E3%82%B9%E3%83%90%E3%82%A4%E3%82%AF/post-1361/>