> Michael, could you please take a look at my reply to David's 
> post in this topic? I'm explaining there what my goal is. If 
> it's still not clear please let me know.
> 

Yes, you've made it clear why you need a dynamic despatch mechanism and
others have made it clear why xsl:apply-templates is the dynamic despatch
mechanism you need.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay