This object indicates the type of device identifier value carried in the ubpNotifyDeviceIdentifier attribute, either devicemgmtadd(1) or snmpengineid(2). It is sent along with the notification so the receiving management station knows how to interpret the accompanying device identifier string, for example as a management address or an SNMP engine ID. For example, ubpNotifyDeviceIdentifierType might report snmpengineid(2) to tell the notification receiver that ubpNotifyDeviceIdentifier holds the sending device's SNMP engine ID rather than a management address.