/usr/share/doc/libxml-dt-perl/examples/jj.dtd is in libxml-dt-perl 0.68-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | <!element musica (music|lyrics|title|com|arquivo)* >
<!element (music,lyrics,title,com) (#PCDATA) >
<!element arquivo EMPTY >
<!element outro ANY >
<!attribute acordes title>
|