Contains an in-depth coverage of the approved W3C Recommendation XML Schema design. This book introduces practical techniques for writing schemas to support any B2B, Web service, or content processing application. It includes working with schemas such as: Schema composition, instance validation, documentation, namespaces, and more.
I've developed several XML schemas in my career, and ended up learning a lot about how to do it well by reading this book. Walmsley lays out her approach in a very consumable fashion, and encourages learners on all levels to start at the beginning and read through to the end.