namespace

A container for node IDs (points in the framework). The OPC foundation specifies a predefined namespace with index 0. Many more namespaces belong to specific OPC UA specifications, for example, DI and PLCopen. Every OPC UA specification defines its own node IDs. (from https://stackoverflow.com).

The OpcUaNamespace component under the OpcUaNetwork node in the Nav tree configures the namespace. The OpcUaServerPointDeviceExt component uniquely identifies each specific node.