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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hingyan.com/category/%E0%A4%AC%E0%A4%BF%E0%A4%AF%E0%A5%8B%E0%A4%97%E0%A5%8D%E0%A4%B0%E0%A4%BE%E0%A4%AB%E0%A5%80/>