XML basics

[Joe Fawcett <joefawcett@hotmail.com>]

Dear All

I've been asked to contribute to a book on basic XML. I have a list of topics that I think should be covered, mostly discussing the basics, showing a few examples and when and where each would be used.
Does anyone have any suggestions on other XML related activities that they feel should be included in an introductory text?
The list so far (those with an asterisk are tentative depending on how large the publisher wants the book).

XML basics
  Elements and Attributes
    Well formed XML
Other node types

Validation
  DTD
  XML Schemas
  Relax NG & Schematron*

Reading Information
  DOM
  XPath
  Event Driven (SAX, XmlReader)

Processing
  XSLT
  XQuery
  LINQ to XML

Uses
  Configuration files
  RSS
  SVG
  Web Services (RPC, SOAP, REST, WCF)
  WSDL
  XHTML (and how HTML 5 may replace)
  XForms*

Thanks for any suggestions.

Joe
http://joe.fawcett.name/