ocaml extension

[Bryan]

i've read a few posts about using ocaml as an extension language for python together.  has anyone done this?  can you 
write the entire extension in ocaml without having to explicitly write an additional c wrapper?  i was told that ocaml 
has exportable functions with c bindings.  if someone has successfully done this, would you mind posting/sharing an 
example hello world extension?

thanks,

bryan