Free XML Tutorials
Another comprehensive site from W3SChools with everthing from an introduction to XML to examples and a quiz.
Kickstart XML Tutorial
This tutorial from SpiderPro is a crash course in XML.
introduction to XML for web developers
XML tutorial for web developers.
XML Schema Tutorial
Schema tutorial, learn what an XML Schema is. You will also learn how XML Schema will replace DTD, and how to use the XML Schema language in your applications.
In this tutorial selected XML features are demonstrated.
In this tutorial basic DTD features are demonstrated on many examples.
Tons of XML resources
XML Schema tutorial
Roger Costello has produced an downloadable XML Schema tutorial which is based on the latest drafts of the XML Schema specifications.
Technical Introduction to XML
This introduction to XML presents the Extensible Markup Language at a reasonably technical level for anyone interested in learning more about structured documents.(long article)
Introduction to XML Processing with Lark and Larval
Lark is a non-validating XML processor implemented in the Java language. Larval is a validating XML processor built on the same code base as Lark. Source code can be downloaded.
An introduction to XSL - The style sheet language of XML. What XSL is and what it can do.
XSL and XSLT
Stylesheets and document transformation