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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://shukrun-hair-blog.hatenablog.com/archive/category/%E3%82%B9%E3%82%BF%E3%82%A4%E3%83%AA%E3%83%B3%E3%82%B0%E5%89%A4>