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There is another part we forgot to talk about: Error Messages Mechanism. There could be a unified way to display error messages for the cases when : - XML validation fails - semantic error occurs in XML file (application logic is broken even when xml validation passes) - mandatory element is missing (result of empty string typed in text field) - duplicate key value (result of incorrect string typed in TF) I tried to implement this mechanism somehow (see the ErrorPanel, which is added to the bottom of MultiViewEditor panel). There is also a "navigation link" from ErrorPanel implemented that navigates user to the source of problem. The Error Messages mechanism (including its UI) can also be treaded as a relatively standalone part of MV Editor.