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Adds a node by its name and namespace URI.
Declaration
Parameters
Description
Use this method to add a node by its name and namespace URI. If there is a node with the same name and namespace URI, already in the list, it is replaced by arg, and the reference to the old node is returned. If there's no node with the same name and namespace URI, as in the node, the node is added and null/nil/Nothing value is returned.