<https://pakstudentsforum.com/viewtopic.php?p=81367dceb31c9f6cd45fe6ab332755aae61d>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pakstudentsforum.com/viewtopic.php?p=8136&sid=7dceb31c9f6cd45fe6ab332755aae61d>