/usr/share/monodoc/web/xtree/xmlextras.js is in monodoc-http 2.10-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/monodoc/web/xtree/../../../javascript/xmlextras/xmlextras.js
/usr/share/monodoc/web/xtree/../../../javascript/xmlextras/xmlextras.js