> That helps. If you don't want to use it, pretty much the only way to 
> achieve what was requested is by a two-stage process.
> 
> Stage 1 would run a stylesheet on the configuration document 
> to generate a 
> stylesheet.
> 
> Stage 2 would run the resulting stylesheet on the source document(s).
> 
> Using saxon:evaluate should allow you to do it in one pass.

It's a little bit trickier than that, because the XPath expression
identified elements to be modified. Evaluating a dynamic XPath expression to
give a set of nodes is one thing; writing a stylesheet that modifies the
nodes in the result of that expression is another.

Also there are multiple expressions, and doing one pass (i.e. a document
copy) for each expression sounds expensive.

If the expressions are constrained to be XSLT patterns, then it would
probably be easier to generate a stylesheet dynamically in this situation.

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