XML encoding from a DSSSL stylesheets?

[Stephane Bortzmeyer <bortzmeyer@xxxxxxxxxx>]

I'm using DSSSL for processing XML documents (request to learn XSL will be 
silently ignored, I'm still searching a free XSL processor, which does not 
depend on non-free software).

I would like to retrieve the encoding declared in the XML Processing 
Instruction, for instance:

<?xml version="1.0" encoding="iso-8859-1"?>

How to do so in DSSSL?

(root
  (make sequence
    (literal (encoding-of-document)) ;; ???



 DSSSList info and archive:  http://www.mulberrytech.com/dsssl/dssslist