JDK1.4 how can we let jdk1.4 use new xerces/xalan

[Tony Nys]

does anyone know which apicalls in jdk1.4 invoke functions in it's
xalan/xerces which is included in the
jdk1.4 distribution ?

in other words, I would not call those api's and our program would use
xerces 2.0.1 and xalan 2.3.1