How to migrate the code from Crimson to Xerces?

Hi,
I am parsing the xml document (SAX Parse) and using crimson.jar with jaxp. I am seeing the performance problems on AIX 4.3. I want to use xerces 2.5 instead of crimson. Could you please let me know what changes i need to make in the source code to use the xerces.
I read an article saying that xerces is faster in AIX machine JVM's where as crimson efficient in Sun Machines.
Thanks in advance for your help.

If you're already using JAXP (your code is not importing anything Xerces-specific), there is no code changes required to switch to using Xerces under the hood -- just set the "javax.xml.parsers.DocumentBuilderFactory" system property to point to the Xerces implementation of that particular interface (or "javax.xml.parsers.SAXParserFactory" for SAX).