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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://clinic-day.com/blog/detail/109/%DA%A9%D8%A7%D8%B4%D8%AA-%D9%85%D9%88-%D8%AF%D8%B1-%D8%AA%D8%A8%D8%B1%DB%8C%D8%B2>