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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tek-nakanoshima.com/%E8%8B%B1%E6%96%87%E6%B3%95%E3%81%AE%E5%8B%89%E5%BC%B7%E6%B3%95%EF%BC%81/>