Major mode for editing Prolog code.
Blank lines and `%%...' separate paragraphs. `%'s starts a comment
line and comments can also be enclosed in /* ... */.
If an optional argument SYSTEM is non-nil, set up mode for the given system.
To find out what version of Prolog mode you are running, enter
Uses keymap `prolog-mode-map', which is not currently defined.
Entry to this mode calls the value of `prolog-mode-hook' if that value is non-nil. (fn)