<https://blog.babauangi.com/2021/10/a79-nghe-nhac-thai-giao-kich-thich-tu.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.babauangi.com/2021/10/a79-nghe-nhac-thai-giao-kich-thich-tu.html>