Greetings,
One thing that I would like to see is Cocoon supporting the XForms 1.0 standard as described on W3C.
http://www.w3.org/MarkUp/Forms/
I would advise against the XForms standard because it is severely broken for client/server type applications. XForms ONLY makes sense in a pure client setting.
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"They that give up essential liberty to obtain a little temporary safety
deserve neither liberty nor safety."
- Benjamin Franklin