I've found XML::LibXML and XML::LibXSLT to be very powerful modules, that when combined are capable of processing large and complex XML files. They are based on the very good Gnome libXML2 and libXSLT libraries.
HTH
* EDIT: Extra Links added *
In reply to Re: XSLT processing huge XMLs
by ajt
in thread XSLT processing huge XMLs
by Anonymous Monk
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