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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://broadbandindiamagazine.com/2021/06/%E3%82%B7%E3%82%A2%E3%82%BF%E3%83%BC%E3%83%AB%E3%83%BC%E3%83%A0-%E6%A8%AA%E6%B5%9C/>