adding to my last email: of course, this way I still did not solve addition of more namespaces. Any ideas on that?

Because, even if I reconstruct the node completely, with the non-updating expressions, I would not know any other syntax, that would match the purpose.

I know, how to construct nodes with simple expressions, using the element constructors, however I am interested in the 'non-updating updating' (and how to call them differently, lol) expressions.