<https://rs.qiwihui.com/solidot/2020/12/01/c891cb1934c55812bfe4249cc2413fa7.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://rs.qiwihui.com/solidot/2020/12/01/c891cb1934c55812bfe4249cc2413fa7.html>