/usr/share/lua/5.2/pl/xml.lua is in lua-penlight 1.3.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.2/pl/../../5.1/pl/xml.lua
/usr/share/lua/5.2/pl/../../5.1/pl/xml.lua