XPath function extensions

[Zeljko VELAJA]

Hi !

How can I write an own XPath function in order to access it from the
XPathAPI ? In the mailing list archive I found an example where Function was
extended and then FunctionTable.installFunction called. Yet it seems that
this is the way Xalan declares its built-in functions. How can I do with
extensions associated with a namespace ? There's certainly things to be done
with the ExtensionsTable class, but I cannot understand how to use it. Can
someone help ?