The symbolic name of each Node defined in this specification is its BrowseName, or, when it is part of another Node, the BrowseName of the other Node, a “.”, and the BrowseName of itself. In this case “part of” means that the whole has a HasProperty or HasComponent Reference to its part. Since all Nodes not being part of another Node have a unique name in this specification, the symbolic name is unique.
The NamespaceUri for all NodeIds defined in this specification is defined in Annex A. The NamespaceIndex for this NamespaceUri is vendor-specific and depends on the position of the NamespaceUri in the Server namespace table.
Note that this specification not only defines concrete Nodes, but also requires that some Nodes shall be generated, for example one for each Session running on the Server. The NodeIds of those Nodes are vendor-specific, including the NamespaceUri. But the NamespaceUri of those Nodes cannot be the NamespaceUri used for the Nodes defined in this specification, because they are not defined by this specification but generated by the Server.