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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://kikuchi-gunma.com/2018/10/13/%E8%A7%A3%E4%BD%93%E5%B7%A5%E4%BA%8B%EF%BC%88%E5%A4%A7%E9%96%93%E3%80%85%EF%BC%89/>