post processing form submit

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post processing form submit

tigne
Hello,
I'm evaluating orbeon PE for my company needs. Our requirements are:
-Let the final user produce their own forms (so Form builder is required)
-Put these forms inside a workflow.
The second point requires  to pre-populate fields when opening the form (i.e. data from the previous step) and process the form submission (we don't need to store data within orbeon persistence layer, but just to grab the xml which will be handled by external components).

I could successfully pre-populate fields using HTTP and DB services components, but I'm stuck with the second need: how can I intercept the form submission?
I think the answer is to use processors, but I cannot figure out how to do it with form builder.
Another option could be to implement a custom persistence layer (based on REST api) just to intercept data, but I fear it might be painful to be done..
Any suggestion?
Many thanks,
Paolo