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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://hajime-karada.com/tag/%E3%82%AA%E3%83%AA%E3%83%B3%E3%83%94%E3%83%83%E3%82%AF%E3%80%81%E9%8D%BC%E6%B2%BB%E7%99%82>