| Chapter 2 of this book is an introduction to XML that should be sufficient for learning the XML features of Office 2003. However, if you plan to use XML products other than Office, develop your own schemas, or use Office to share data with enterprise systems and Web services, you'll want to learn more about XML. As our readers will have differing experience with XML and different requirements for its use, there seemed no sensible way to intersperse detailed XML education with the Office XML tasks that are the focus of the book. Instead we've put the detailed tutorials and references on the XML language and related standards where you can easily find them when you need them. They are in Part Three. The book's Table of Contents and Index can guide you to specific subjects, and we also provide appropriate cross-references to them from the Office XML task chapters in Part Two. While we chose and edited the XML tutorials to emphasize the aspects that are supported in Office, we did so fully aware that the focus of the book is on sharing information, including between Office and other systems that could have more complete XML support. For that reason, we also cover, though in less detail, XML facilities that Office does not support fully. | 
