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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.saburina.fun/entry/2024/02/18/%E7%A2%BA%E5%AE%9A%E7%94%B3%E5%91%8A%E3%81%99%E3%81%B9%E3%81%8D%EF%BC%9F>