<https://edu.technion.ac.il/research/%d7%aa%d7%a7%d7%a9%d7%95%d7%a8%d7%aa-%d7%94%d7%9e%d7%93%d7%a2/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://edu.technion.ac.il/research/%D7%AA%D7%A7%D7%A9%D7%95%D7%A8%D7%AA-%D7%94%D7%9E%D7%93%D7%A2/>