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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://fudousan-how2.com/2020/05/12/%E7%81%AB%E7%81%BD%E4%BF%9D%E9%99%BA%E3%81%AE%E7%94%B3%E8%AB%8B%E6%96%B9%E6%B3%95/>