Integration

I am trying to iterate through a tree structure - a response element where an object is nested within itself. This can go on for 'n' levels and I am trying to get the Id of each object and populate it into a list of strings, from which I can iterate. I find that I am not able to do it through XSL transformations.

Is there any way I can do it - perhaps Java Embedding? I have struggling with this for days and would kindly appreciate any response.