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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.bazicenter.com/threads/%D8%AA%D8%B5%D9%88%DB%8C%D8%B1-%D8%A8%D8%A7%D8%B2%DB%8C-quadratum-mortis.55972/>