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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://lgbttokoya.hatenablog.com/archive/category/%E7%9C%8B%E6%9D%BF%E7%8A%AC%E3%81%AE%E3%81%84%E3%81%8F%E3%82%89>