creating a new module as an extention of another module

[david herviou <herviou@...>]

Hi all,
I'm now using lua 5.1 and migrating my previous package system ('hack' 
describes in pil 5.0) to this lua version.
I think it's now very clean with this new package module system but I 
have a question on how to do a module
that is an extension of an another module?
for example
 --file : rule.lua
   module("rule")
   function and(r1,r2) ... end
   function or(r1,r2) ... end

suppose now you want to extend the previous module with to have a 
CompleteRule system
   --file completeRule.lua
   module("completeRule")
   require "rule"
  
   function notUnary(r1) ... end

the question is finally how to push all function of module rule into the 
module completeRule. In a way, it's like inheritance for class.
I think I have already seen such mecanism in Ocaml.
Someone as an idea? or is it to basic to ask the question (I'm a newbie 
concerning the packaging system)?

Thanks.
dh

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