Hi vsespb,
thanks for the clarification.
in my xml, my idea was that normal users will just change the flow if required.
expert users will have additional feature to add pretasks/post tasks.
Idea is to identify a solution which supports plug and play/customization and at the same time provides flexibility to the flow. perl/xml solution is just an idea, we can ignore it if we have better solutions available.
Btw, updated question with a real life example.
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