The QosDataTypes defined in the following chapters are used in the DatagramQos parameter in different datagram specific transport protocol mapping settings.

The DatagramQos contains an array of QosDataTypes. The array is null or empty if no QoS related parameters are set.

The DatagramQos parameter is always combined with a QosCategory parameter. Depending on the content of the QosCategory String, different elements need to be present within the DatagramQos array.

The specific processing of the QosCategory and DatagramQos content is described in 5.4.6.4.

Standard QosCategory values are defined in Table 117.

Table 117 – Standard QosCategory values

QosCategory	Description
Null or empty	This category indicates best-effort is used. DatagramQos shall be null or empty.
Opc.qos.cat://priority	This category indicates priority is used. DatagramQos shall contain one element of TransmitQosPriorityDataType or ReceiveQosPriorityDataType and optionally further elements which may be omitted.