<https://www.jetseo.ir/article/26/%D9%BE%D8%B3%D8%AA-%D9%85%D9%87%D9%85%D8%A7%D9%86-%DA%86%DB%8C%D8%B3%D8%AA>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.jetseo.ir/article/26/%D9%BE%D8%B3%D8%AA-%D9%85%D9%87%D9%85%D8%A7%D9%86-%DA%86%DB%8C%D8%B3%D8%AA>