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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ietai07170919tsubaki.hatenablog.com/archive/category/%E5%A4%8F%E9%A2%A8%E9%82%AA%E5%BC%95%E3%81%84%E3%81%A6>