There are a few incompatibilities introduced in the XSLT 2.0 and XPath 2.0 specifications, these are documented in appendices to the specs. You aren't very likely to run into these.
 
Some of the Saxon extensions that were present in 6.5.3 have been replaced by standard facilities in XSLT 2.0 or XPath 2.0, and you will have to convert your stylesheets if you use these.
 
If you have written your own extension functions, then in most cases they should continue to work, unless the extension functions make use of classes in Saxon itself.
 
I reckon Saxon 7.8 is generally about 25% faster than 6.5.3, but it depends on the stylesheet. If you are short of memory, then 7.8 may be a bit slower.
 
Michael Kay
-----Original Message-----
From: saxon-help-admin@lists.sourceforge.net [mailto:saxon-help-admin@lists.sourceforge.net] On Behalf Of Nestor Boscan
Sent: 31 January 2004 14:05
To: saxon-help@lists.sourceforge.net
Subject: [saxon] Upgrading from 6.5.3 to 7.8

Hi
 
Are the any problems upgrading my stylesheets from 6.5.3 to 7.8. Do they run faster?. I have many external Java functions that were built under the 6.5.3 specification, do I have to change them in 7.8?.
 
Thanks in advance