<https://profblog.org/archives/tag/%e0%b9%81%e0%b8%ad%e0%b8%9e%e0%b8%9e%e0%b8%a5%e0%b8%b4%e0%b9%80%e0%b8%84%e0%b8%8a%e0%b8%b1%e0%b9%88%e0%b8%99>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://profblog.org/archives/tag/%E0%B9%81%E0%B8%AD%E0%B8%9E%E0%B8%9E%E0%B8%A5%E0%B8%B4%E0%B9%80%E0%B8%84%E0%B8%8A%E0%B8%B1%E0%B9%88%E0%B8%99>