<https://tlvmed.co.il/blog/%d7%a6%d7%a8%d7%99%d7%91%d7%94-%d7%91%d7%a9%d7%aa%d7%9f/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://tlvmed.co.il/blog/%D7%A6%D7%A8%D7%99%D7%91%D7%94-%D7%91%D7%A9%D7%AA%D7%9F/>