[Question already adequately answered by everyone else.  Just to add ...]

I use tuareg-mode in emacs, with the configuration below.  It does a
pretty good job of indenting code to show the logical structure.

(setq auto-mode-alist (cons '("\\.ml\\w?" . tuareg-mode) auto-mode-alist))
(autoload 'tuareg-mode "tuareg" "Major mode for editing Caml code" t)
(autoload 'camldebug "camldebug" "Run the Caml debugger" t)
(if (and (boundp 'window-system) window-system)
    (require 'font-lock))
(add-hook 'tuareg-mode-hook
          '(lambda ()
             (setq tuareg-in-indent 0)
                                        ; no indentation after `in' keywords
             ))

Rich.

-- 
Richard Jones. http://www.annexia.org/ http://www.j-london.com/
Merjis Ltd. http://www.merjis.com/ - improving website return on investment
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