prolog-mode-specificators

prolog-mode-specificators is a variable defined in `prolog.el'.
Its value is

((mercury
  ("bound" "di" "free" "ground" "in" "mdi" "mui" "muo" "out" "ui" "uo"))
 (t nil))

Documentation:
Alist of Prolog mode specificators used by font locking.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.