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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://seiryo-rc.com/blog/%E3%83%95%E3%83%BC%E3%83%89%E3%83%90%E3%83%B3%E3%82%AF%E3%81%B8%E5%A5%89%E4%BB%95%E6%B4%BB%E5%8B%95/>