Please note the time taken for transform in different versions of Xalan,
Xerces for the same xml and style sheet files. 
With Xalan 1.6 and Xerces 2.3 the transformation takes around 5.41 minutes,
compared to 57.95 minutes  with Xalan 1.10 and Xerces 2.7 :

With Xalan 1.6 and Xerces 2.3
Xalan -t -o pdp.out Calendar.xml ConvertCalendarsToPdp_1.xsl
Source tree parsing time: 668.791 milliseconds.
Stylesheet compilation time: 89.449 milliseconds.
Transformation time: 324617.921 milliseconds. (5.41 minutes)

With Xalan 1.10 and Xerces 2.7 
Xalan -t -o pdp.out Calendar.xml ConvertCalendarsToPdp_1.xsl
Source tree parsing time: 71.238 milliseconds.
Stylesheet compilation time: 14.367 milliseconds.
Transformation time: 3477100.2128 milliseconds. (57.95 minutes)

Since we are currently using  Xalan 1.10 and Xerces 2.7 , please suggest how
we can better the transform() time. 




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