> -Namespace created in my xsl: xmlns:myTest="GLP.Base64DecodeFromXML"

What package is the class in?  You need to use that as the namespace,
not the jar name...  (eg something like
com.mycomp.utils.Base64DecodeFromXML)

If you're not sure, open the jar with winzip or winrar or similar, and
browse the directory structure until you locate the class, that
directory structure is the package.


-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/