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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.curtain-f.com/staffblog/staffblogtag/%E3%82%AB%E3%83%BC%E3%83%86%E3%83%B3%E3%83%95%E3%83%83%E3%82%AF/>