All in a day's work

1. Parse a XML tree
2. Expand some value in child node in the tree and update the node in tree, keep count about how many subtree we will get from expansion and break for 3.
   
3. Break at some nodes to create a list of new XML trees
4. Convert each new tree from 3. to a different tree
5. Combine trees from 4. to another new tree

Isn't this fun?