Link: http://www.liquid-technologies.com/XsdTutorial_01.aspx
Source Author or Organization: Liquid Technologies

A 5 Part Tutorial covering Elements and Attributes - Schema Overview - Elements - Cardinality - Simple Types - Complex Types - Compositors - Reuse - Attributes - Mixed Element Content Conventions & Recommendations - When to use Elements or Attributes - Mixed Element Content - Conventions Extending Existing Types - Extending a ComplexType - Restricting an Existing ComplexType - Use of Extended/Restricted Types - Extending Simple Types (Union, List, Restriction) Namespaces Misc - Element and Attribute Groups - any (Element) - anyAttribute The tutorial includes samples and diagrams, and is aimed at beginners to intermediates.