<https://blogxaydung.net/cach-tinh-noi-luc-ban-dam-sieu-tinh-theo-so-do-deo/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blogxaydung.net/cach-tinh-noi-luc-ban-dam-sieu-tinh-theo-so-do-deo/>