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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.danielkfir.com/%D7%A2%D7%95%D7%93-%D7%A0%D7%94%D7%99%D7%92%D7%94-%D7%AA%D7%97%D7%AA-%D7%94%D7%A9%D7%A4%D7%A2%D7%AA-%D7%A1%D7%9E%D7%99%D7%9D/>