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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kaizen10.hatenablog.com/archive/category/%E9%BB%92%E3%81%8F%E5%A1%97%E3%82%8A%E3%81%A4%E3%81%B6%E3%81%97%E3%81%A6>