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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://heppokorun.net/2018/05/16/%E3%83%95%E3%83%A9%E3%82%B0%E3%81%8C%E7%AB%8B%E3%81%A1%E3%81%9D%E3%81%86/attachment/1934/>