How to call an XSLT function whose name isn't known ti

Hi Folks,

I have an XSLT variable, $function-to-invoke, that holds the name of an XSLT
function to be invoked. For example, if $function-to-invoke holds the string
"move" then I  want my XSLT program to invoke the function with that name,
i.e., invoke f:move(...). Is there a way for XSLT to call a function whose
name isn't known till run-time?

/Roger