The important thing for the "modules" is to provide script friendly access of environment data in a simple way. I assumed that the easiest way would be to support "POJO" interfaces with get and set methods and Maps so that it would be easy to use for the reflection parts of ELs and scripting languages, but I don't know that much about it.
You may want to look at: http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/api/javax/faces/context/ExternalContext.html
Basically, what they did, they abstracted out servlet API: request.getParameter() request.getAttribute() request.getSession().getAttribute() ...
Into POJO / Maps, EL friendly interface:
context.getRequestParameterMap() context.getRequestMap() context.getSessionMap() context.getApplicationMap()
Having something like that (parameters/attributes access via maps) in Cocoon environment probably is not a bad idea.
Vadim
