Currently OPC UA Clients do not know if a OPC UA Server has finished inserting nodes into a Namespace. This leads to different Client implementations for waiting until a Namespace is ready (try to browse or read a node until its possible, ...).

Proposal:
Additionally to the NamespaceArray Property a NamespaceReadyArray Boolean-Property could be added, which indicates if all nodes of this Namespace are present in the Information Model. It could also be represented via a Integer-Property which shows the progress in percent.

Also an OPC UA Event, that the Server finished building a Namespace should be sent.

Its not possible to put this information into the Namespace-Metadata, because it could be possible that not even this nodes are available yet!