internationalization

[Tahura Chaudhry]

I am writing an application which, given the context path and the XPath 
expression, uses Xalan (version 2.6.2) to evaluate the expression.  If the 
entered expression is incorrect, Xalan throws an exception whose friendly 
string I'd like to display to the user.

I see that the org.apache.xpath.res contains the java source files 
(XPathErrorResources.java) for different locales. The source files contain 
strings that require internationalization.  The friendly strings as I 
understood are also defined in the Java source files in this package.

My question is that if I intended to add support for a locale, would I write 
the resource java source file for that locale and build it together with 
Xalan.  Or is it possible for me to write this java file for the new locale 
independently at some later time.

Is there any documentation explaining Internationalization support in Xalan?
thanks,
Tahura