<https://baobitcoin.com/category/kien-thuc-tien-dien-tu/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://baobitcoin.com/2021/03/chainlink-ve-su-thay-doi-trong-defi-tu-cefi-dang-dien-ra-nhu-the-nao/>