pickle complexity limit?

[Frank Bechmann]

If I understood your problem correctly it might help to find out
multiple occurences of childs in your tree, define them once and
giving them a unique ID and then using the ID in following occurences
and the appropriate XML syntax.

I can't remember the details but at least I can remember having seen
this kind of logic in the python ZSI framework (when a SOAP/XML tree
is created from python-objects), available at
http://pywebsvcs.sourceforge.net/zsi.html.

Hope this helps.