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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pad.fandom.com/zh/wiki/%E3%82%BC%E3%82%A6%E3%82%B9%EF%BC%86%E3%83%98%E3%83%A9%E9%99%8D%E8%87%A8%EF%BC%81?variant=zh-sg>