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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tokuchubane.com/glossary/%E6%91%A9%E6%93%A6%E3%81%B0%E3%81%AD%E3%81%AE%E7%B5%84%E3%81%BF%E5%90%88%E3%81%9B%E6%95%B0/>