Hi to all!
I made a simple "proof of concept" library to work with xml in a functional style. Here it is: https://github.com/vegansk/xmltools. Some of it's features was inspired by the scala's xml library.
And here is a small example comunicating with the SOAP web service: https://gist.github.com/vegansk/af99639d725388b6b344
It works with the devel branch of Nim. The documentation is coming soon :-)