http://www.w3schools.com/schema/ //Good tutorials on XML Schema
|An XML Schema describes the structure of an XML document.
In this tutorial you will learn how to create XML Schemas, why XML Schemas are more powerful than DTDs, and how to use XML Schema in your application.
Introduction to XML Schema
XML Schema is an XML-based alternative to DTD.
An XML schema describes the structure of an XML document.
The XML Schema language is also referred to as XML Schema Definition (XSD).