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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://smdd.seehua.com/%E7%B4%A0%E8%8A%8B%E8%8F%87%E9%B1%BC%E3%80%90%E8%9B%8B%E7%B4%A0-%E7%BA%AF%E7%B4%A0%E3%80%91/>