Hi Derek,
...What I am trying to figure out is how to get the altered string (DOM) "back into" the form data that needs to be saved. i.e. between the two steps that I had listed. ..
Have you looked at CForms custom bindings yet? Without having looked at your problem in detail, it looks like this might help you.
See http://cocoon.apache.org/2.1/userdocs/forms/binding.html#fb%3Acustom
-Bertrand
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