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Extension Functions example?

Extension Functions example?

2007-04-27       - By Rick Gordon

I'm having trouble getting  extension functions written in JavaScript
working with Xalan 2.7.0.

We've been using Xalan 2.6.0 (with memory leak patched), and the older
com.ibm BSF package.
We'd like to move up - in part due to problems getting the above to work
on RHEL5 with IBM Java and Tomcat, and in part
just because we don't want to fall to far behind!

In running some experiments in RHEL4, I was never able to actually get
Xalan to instantiate the BSF correctly - it would
always just throw an  exception while trying to instantiate the
extension handler when the servlet tried to process the xslt.

There are so many details and configuration options - too many to
enumerate here I suspect.
In order to meet a deadline, I had to revert back to 2.6 for the moment,
but would like to get this solved.

Google just showed me that a couple of other people have had problems,
but no solutions.

I wonder if anyone on this list can point me to a working example of
extension functions implemented using BSF?