Actions Add : The specified ChangedDataLayer is a newly createdUDataLayerInstanceModify : The specified ChangedDataLayer was just modified, if ChangedDataLayer is invalid then multiple DataLayers were modified. ChangedProperty specifies what field on theUDataLayerInstancewas changed, if NAME_None then multiple fields were changed Delete : A DataLayer was deleted Rename : The specified ChangedDataLayer was just renamed Reset : A large amount of changes have occurred to a number of DataLayers.