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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ja.m.wikipedia.org/wiki/%E3%82%B0%E3%83%AC%E3%82%B4%E3%83%AA%E3%82%A6%E3%82%B97%E4%B8%96_(%E3%83%AD%E3%83%BC%E3%83%9E%E6%95%99%E7%9A%87)>