<https://vuicuoilen.com/con-lac-da-tieng-anh-la-gi-va-doc-nhu-the-nao-cho-dung>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://vuicuoilen.com/con-lac-da-tieng-anh-la-gi-va-doc-nhu-the-nao-cho-dung>