/usr/share/xml/docbook/custom/website/2.5.0/extensions/saxon64.jar is in docbook-website 2.5.0.0-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/xml/docbook/custom/website/2.5.0/extensions/../../../../../../java/docbook-website-saxon64-2.5.0.jar