/usr/share/sgml/docbook/custom/website 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/sgml/docbook/custom/../../../xml/docbook/custom/website
/usr/share/sgml/docbook/custom/../../../xml/docbook/custom/website