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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://anton0825.hatenablog.com/archive/category/%E3%82%A2%E3%83%A1%E3%83%AA%E3%82%AB%E6%97%85%E8%A1%8C%E8%A8%98>