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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://geshi-piano.com/2022/08/26/%E9%AA%A8%E6%8A%98%E3%81%97%E3%81%A1%E3%82%83%E3%81%A3%E3%81%9F%E3%83%BC-%E3%80%80%E3%81%A6%E3%81%8B/>