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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.sfpgmr.net/blog/entry/%E3%83%9D%E3%82%B1%E3%83%9F%E3%82%AF%E3%83%BB%E3%82%B7%E3%83%BC%E3%82%B1%E3%83%B3%E3%82%B5%E3%83%BC%E3%82%92%E4%BD%9C%E3%82%8B2.html>