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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://vectorworks-bim.com/2017/04/22/%E6%9C%A8%E9%80%A0%E5%BB%BA%E5%85%B7%E8%A9%B3%E7%B4%B0%E3%83%84%E3%83%BC%E3%83%AB/>