Took a very quick look at Yves' example, with -EDUMP turned on in Xalan. 

Had to take a SWAG at reasonable values for  the $type variable, and for 
the select_nodes_by_type keyset. When I did so, the stylesheet ran with no 
errors. And no output, but that's to be expected given the fragmentary 
nature of what Yves showed us.

If you want a more detailed response, please come up with a small runnable 
example that demonstrates the problem. Otherwise I have to chalk this up 
as "not reproducable, probably user error or obsolete version of Xalan."

______________________________________
Joe Kesselman  / IBM Research

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list