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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://data-fusion.net/2021-09-07-%E3%81%8A%E3%81%8B%E3%81%82%E3%81%95%E3%82%93%E3%81%A8%E3%81%84%E3%81%A3%E3%81%97%E3%82%87/>