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The W3Cs XML Schema offers a powerful set of tools for defining acceptable XML document structures and content. While schemas are powerful, that power comes with substantial complexity. This book explains XML Schema foundations, a variety of different styles for writing schemas, simple and complex types, datatypes and facets, keys, extensibility, documentation, design choices, best practices, and limitations. Complete with references, a glossary, and examples throughout.

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XML Schema
Eric van der Vlist
Editor
Simon St. Laurent

Copyright 2011 O'Reilly Media, Inc.

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A Note Regarding Supplemental Files

Supplemental files and examples for this book can be found at http://examples.oreilly.com/9780596002527/. Please use a standard desktop web browser to access these files, as they may not be accessible from all ereader devices.

All code files or examples referenced in the book will be available online. For physical books that ship with an accompanying disc, whenever possible, weve posted all CD/DVD content. Note that while we provide as much of the media content as we are able via free download, we are sometimes limited by licensing restrictions. Please direct any questions or concerns to .

Preface

As developers create new XML vocabularies, they often need todescribe those vocabularies to share, define, and apply them. Thisbook will guide you through W3C XML Schema, a set of Recommendationsfrom the World Wide Web Consortium (W3C). These specifications definea language that you can use to express formal descriptions of XMLdocuments using a generally object-oriented approach. Schemas can beused for documentation, validation, or processing automation. W3C XMLSchema is a key component of Web Services specifications such as SOAPand WSDL, and is widely used to describe XML vocabularies precisely.

With this power comes complexity. The Recommendations are long,complex, and generally difficult to read. The Primer helps, ofcourse, but there are many details and style approaches to considerin building schemas. This book attempts to provide an objective, andsometimes critical, view of the tools W3C XML Schema provides,helping you to discover the possibilities of schemas while avoidingpotential minefields.

Who Should Read This Book?

Read this book if you want to:

  • Create W3C XML Schema schemas using a text editor, XML editor, or aW3C XML Schema IDE or editor.

  • Understand and modify existing W3C XML Schema schemas.

You should already have a basic understanding of XML documentstructures and how to work with them.

Who Should Not Read This Book?

If you are just using an XML application using a W3C XML Schemaschema, you probably do not need to deal with the subtleties of theRecommendation.

About the Examples

All the examples in this book have been tested with the XSV andXerces-J implementations of W3C XML Schema running Linux (the Debiansid distribution). I have chosenthese tools for their high level of conformance to the Recommendation(the best ones according to the tests I have performed); the vastmajority runs without error on these implementationshowever,the Recommendation is sometimes fuzzy and difficult to understand,and there are some examples that give different results withdifferent implementations. These conform to my own understanding ofthe Recommendation as discussed on the xmlschema-dev mailing list(the archives are available at http://lists.w3.org/Archives/Public/xmlschema-dev).

Organization of This Book

This chapter examines why we would want to bring a new XML Schemalanguage onto the XML scene and what basic benefits W3C XML Schemaoffers.

This chapter presents a first complete schema, introducing the basicfeatures of the language in a veryflat style.

With W3C XML Schema, style matters. This chapter gives a secondexample of a complete schema, describing the same class of documents,and written in a completely different style calledRussian doll design.

W3C XML Schema also provides datatyping. In this chapter, we explorehow these types can be bound to the content of our document.

This chapter guides you through the process of defining your ownsimple types.

This chapter explores how to constrain new datatypes using regularexpressions.

Now that we know all about simple types, this chapter explores thedifferent complex types that can be used to define structures withinan XML document.

This chapter shows how to organize schema tools into reusablebuilding blocks.

In addition to content (simple types) and structure (complex types),W3C XML Schema can constrain the identifiers and references within adocument. We explore this feature in this chapter.

Support for XML namespaces is one of the top requirements of W3C XMLSchema. This chapter explains how this requirement has beenimplemented and its implications.

This chapter shows how schema information may be embedded in the XMLinstance documents.

This chapter explains how more building blocks may be defined, byplaying with namespaces and justifying the object-orientedqualification given to W3C XML Schema.

This chapter gives some hints to write extensible and open schemas.

This chapter shows how schemas can be documented and made morereadable, either by humans or programs.

This is a quick reference guide to the elements used by W3C XMLSchema.

This is a quick reference guide to the W3C XML Schema predefinedtypes.

W3C XML Schema is not the only language of its kind. Here we providea short history of this not-so-new family and see some of itscompetitors.

If you want to look ahead at whats to come from theW3C, you may be interested in this list of promising developments yetto be done in relation with W3C XML Schema.

This provides short definitions for the main concepts and acronymsmanipulated in the book.

Conventions Used in This Book
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Acknowledgments

I would like to thank the contributors of xmlhack for theirencouragements, and more specifically Simon St.Laurent, whose rolehas been aggravated by the fact that he has also been my editor forthis book and has shown a remarkable level of helpfulness andpatience. Id also like to thank Edd Dumbill, whohelped me set up Debian on the laptop on which this book was written.

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