slide 37
References
Jeni Tennison,
XSLT on the Edge
(Wiley, 2001)
Sal Mangano,
XSLT Cookbook: Solutions and Examples for XML and XSLT Developers
(O'Reilly, 2002)
Rick Jelliffe, Schematron. See
http://xml.ascc.net/resource/schematron/schematron.html