Validate XML Using XSD
You can validate XML documents against any data model defined using W3C XSD, using any major XSD Validator, including MSXML 3.0, MSXML 4.0, MSXML 6.0, Xerces-J, Xerces-C, Microsoft System.XML (1.0 and 2.0), XSV, the Saxonica XSD Validator and others.
Using Relational Data in XML Applications
"Using Relational Data in XML Applications" By Dr. Michael Kay covers an overview of several common use cases and provides insight into the benefits and drawbacks of using the approaches available today including XQuery and SQL/XML.
Sybase
Sybase Adaptive Server Enterprise (ASE) is a powerful high-performance database for recording and retrieving business records. Learn how to develop XML applications for Sybase using Stylus Studio.
XML Schema Tutorial
An XML Schema Tutorial that explores real-world XML Schema development issues, XML Schema examples and various use cases.