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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://camp-fire.jp/projects/231835/activities?tags=%E3%83%A1%E3%83%B3%E3%83%90%E3%83%BC%E3%81%AE%E6%83%B3%E3%81%84>