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interface Stateful {

public void saveState(Page page, Context context)
// public void saveState(Page page, Context context, Map options)??
  // By default save in session under its name+page path
 // This method can call getState to retrieve this components state
  // Optimization includes GZIP compressing the state


public void restoreState(Page page, Context context)
//public void restoreState(Page page, Context context, Map options)??
  // Grab state from session and invoke setState

public Object getState() {
  // Assemble state and return as object. This allows developers to save state in cookie instead.
// It also allows parent containers to assemble its children state recursively
// If this control is a container it should assemble all its child control state.
}

public void setState(Object state) {
    // Cast object back to its type and set state to this control and its children
}

public String getStateFormatted() {
  // Return a user friendly presentation of the state
}