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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://chimaring.hatenablog.com/archive/category/%E3%82%A6%E3%83%81%E3%81%AE%E3%83%AF%E3%83%B3%E3%82%B3%E3%81%8F%E3%82%93>