/usr/lib/x86_64-linux-gnu/libxml++-2.6.so is in libxml++2.6-dev 2.40.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxml++-2.6.so.2.0.7
/usr/lib/x86_64-linux-gnu/libxml++-2.6.so.2.0.7