in memory tree representation SAXON

Hi,
I 'd like to know, if the in-memory tree representation in saxon is 
removed or not after each transformation.
Is it  possible to deduce the in-memory  result tree representation from 
the first one. i'd like to transform the first one to get the result tree.
I'm trying to find a way to conserve the indexation through a 
transformations composition.
thanks

phil. Dubreuil


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