Event which is raised when a root document in a DerivedModelDefinition has been changed, added or removed. The root document involved is enclosed inside the event args. At time of the event raise, the document does refer back to the containing DerivedModelDefinition, but it's not guaranteed that this stays this way, e.g. in case of a remove

public event EventHandler<ElementInListChangedEventArgs<DerivedModelContainingDocumentsChangeType, RootDocumentDefinition>> RootDocumentInModelChanged

Public Event RootDocumentInModelChanged As EventHandler(Of ElementInListChangedEventArgs(Of DerivedModelContainingDocumentsChangeType, RootDocumentDefinition))