/usr/share/doc/libxml2-dbg/AUTHORS is in libxml2-dbg 2.7.8.dfsg-5.1ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libxml2-dbg/../libxml2/AUTHORS
/usr/share/doc/libxml2-dbg/../libxml2/AUTHORS