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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://k-hirano.com/books/%E3%81%94%E6%9C%AC%E3%80%81%E5%87%BA%E3%81%97%E3%81%A8%E3%81%8D%E3%81%BE%E3%81%99%E3%81%AD%EF%BC%9F-2>