Has anyone found such a mode please?

;;;; xslide3.el --- XSL Integrated Development Environment
;; Copyright (C) 1998, 1999, 2000, 2001, 2003, 2011, 2013 Tony Graham

;; Author: Tony Graham <tkg@xxxxxxxxxxxx>
;; Contributors: Simon Brooke, Girard Milmeister, Norman Walsh,
;;               Moritz Maass, Lassi Tuura, Simon Wright, KURODA Akira,
;;               Ville Skytto?=, Glen Peterson
;; Created: 29 July 2011
;; Keywords: languages, xsl, xml