<https://forum.mypst.com.br/index.php?/topic/30528-ps4-qual-sua-%C3%BAltima-platina/page/259/#comment-1028923>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forum.mypst.com.br/index.php?/topic/30528-ps4-qual-sua-%C3%BAltima-platina/page/259/&tab=comments#comment-1028971>