Multi -step processing in a function using XSLT 2.0

Hi,
  In a function, I need to create a temporary tree using a xsl:variable.
  Then within the same function, I need to create another temporary tree and pass the first tree
to it.
  The function then returns some strings based on the second temporary tree.
  How should I go about doing this? I know I can break the function up into a couple or use
templates but I wanted all code related to this multi-step processing to be confined to this
function.

Thanks,
Anupam.


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