We have a XML export feature in a client where the client can browse/read a server and export a namespaces as UANodeset XML.
Currently we export the values in binary encoded form if they are complex and not namespace 0
But this creates problems with modeling tools that do not support binary encoding.

Now we want to implement the XML encoding for all data but a lot of servers do not expose the XML encoding IDs for their structures if they do not support XML encoding.

Therefore we do not know the XML EncodingID for the structures. But the XML encoding of ExtensionObjects requires the knowledge of the EncodingId.

It Is currently not allowed to use the DataType NodeId instead.

The XML encodingId only works in client/server communication if the server provides the XML encoding IDs.