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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kattenitsukubataishi.hatenablog.jp/archive/category/%E3%81%A4%E3%81%8F%E3%81%B0%E5%B8%82%E5%A4%A7%E8%A7%92%E8%B1%86>