ModelChangeEventsare generated to indicate a change of the AddressSpacestructure. The change may consist of adding or deleting a Nodeor Reference.Although the relationship of a Variableor VariableTypeto its DataTypeis not modelled using References, changes to the DataType Attributeof a Variableor VariableTypeare also considered as model changes and therefore a ModelChangeEventis generated if the DataType Attributechanges.