XalanSourceTree memory usage

[Mark Northcott]

I am currently looking into the amount of memory being used when Xalan
creates a XalanSourceTree from the InputSource when processing a
transformation.  The application I am using Xalan within has the
potential for very large XML files (100+ MB) needing to transformed, and
based upon tests I have run, it appears that the tree built within Xalan
uses about as much memory as the actual size of the XML file.  Is there
any way of getting around this and limiting the amount of memory
required?