16. The method of claim 1 , wherein a state in the recursive transition network flow controller has a subdialog attribute that is associated with a name of a flow controller invoked as a subdialog, to yield an invoked subdialog.
17. The method of claim 16 , wherein the state in the recursive transition network flow controller having the subdialog attribute further comprises a set of instructions that retrieve values from a parent dialog and a set of values in the invoked subdialog.