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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://chirashi-bunseki.hatenablog.com/archive/category/%E9%B4%A8%E3%81%AE%E3%81%A4%E3%81%BF%E3%82%8C%E9%A2%A8>