> It does occur to me that what we are facing is a collective 
> coming-to-grips with the question of 
> queries-as-transformations and transformations-as-queries, 

Queries extract a small part of the information available from some
resource. Transformations convert the representation of information into a
different form. It's quite possible, therefore, for a task to involve both
query and transformation. XQuery is stronger at the query part, XSLT is
stronger at the transformation part...

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