Stylus Studio has just released a new XQuery tutorial entitled:
Defining your own Functions in XQuery. This tutorial allows developers
to learn how to leverage powerful XQuery functions. "Defining your own
Functions in XQuery" was written by, Dr. Michael Kay, founder of
Saxonica.  You can read the tutorial online at:
http://www.stylusstudio.com/xquery/xquery_functions.html

This new tutorial "Defining your own Functions in XQuery" covers the
following topics:

  A simple XQuery function example
  The function name
  XQuery Function arguments
  The result type
  The function body
  Modules and Schemas
  Documenting XQuery functions
  Using Functions to Mask Schema Complexity   Writing Recursive Queries

You can  download a free trial of Stylus Studio at:
http://www.stylusstudio.com/xml_download.html

Sincerely,
The Stylus Studio Team
http://www.stylusstudio.com