<https://ar.wikihow.com/%D8%B5%D9%86%D8%B9-%D8%B1%D9%82%D8%A7%D8%A6%D9%82-%D8%A7%D9%84%D9%85%D9%88%D8%B2>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ar.wikihow.com/%D8%B5%D9%86%D8%B9-%D8%B1%D9%82%D8%A7%D8%A6%D9%82-%D8%A7%D9%84%D9%85%D9%88%D8%B2>