Eric Van Der Vlist

XML Schema (eBook, ePUB)

The W3C's Object-Oriented Descriptions for XML

• Format: ePub

Produktbeschreibung

If you need to create or use formal descriptions of XML vocabularies, the W3C's XML Schema offers a powerful set of tools for defining acceptable document structures and content. An alternative to DTDs as the way to describe and validate data in an XML environment, XML Schema enables developers to create precise descriptions with a richer set of datatypes?such as booleans, numbers, currencies, dates and times?that are essential for today?s applications.Schemas are powerful, but that power comes with substantial complexity. This concise book explains the ins and outs of XML Schema, including design choices, best practices, and limitations. Particularly valuable are discussions of how the type structures fit with existing database and object-oriented program contexts. With XML Schema, you can define acceptable content models and annotate those models with additional type information, making them more readily bound to programs and objects. Schemas combine the easy interchange of text-based XML with the more stringent requirements of data exchange, and make it easier to validate documents based on namespaces.You?ll find plenty of examples in this book that demonstrate the details necessary for precise vocabulary definitions. Topics include:Foundations of XML Schema syntaxFlat, "e;russian-doll"e;, and other schema approachesWorking with simple and complex types in a variety of contextsThe built-in datatypes provided by XML SchemaUsing facets to extend datatypes, including regular expression-based patternsUsing keys and uniqueness rules to limit how and where information may appearCreating extensible schemas and managing extensibilityDocumenting schemas and extending XML Schema capabilities through annotationsIn addition to the explanatory content, XML Schemaprovides a complete reference to all parts of both the XML Schema Structures and XML Schema Datatypes specifications, as well as a glossary. Appendices explore the relationships between XML Schema and other tools for describing document structures, including DTDs, RELAX NG, and Schematron, as well as work in progress at the W3C to more tightly integrate XML Schema with existing specifications.No matter how you intend to use XML Schema - for data structures or document structures, for standalone documents or part of SOAP transactions, for documentation, validation, or data binding ? all the foundations you need are outlined in XML Schema.

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Produktdetails

• Verlag: O'Reilly Media
• Seitenzahl: 400
• Erscheinungstermin: 25. Juni 2002
• Englisch
• ISBN-13: 9781449315375
• Artikelnr.: 40530013

Autorenporträt

Eric van der Vlist is the resident expert on XML schema languages on XML.com. He is also a member of the ISO DSDL committee, where standardization work on RELAX NG and related specifications is in progress. Eric is also the author of O'Reilly's XML Schema.

Inhaltsangabe

Preface
Who Should Read This Book?
Who Should Not Read This Book?
About the Examples
Organization of This Book
Conventions Used in This Book
How to Contact Us
Acknowledgments
Chapter 1: Schema Uses and Development
1.1 What Schemas Do for XML
1.2 W3C XML Schema
Chapter 2: Our First Schema
2.1 The Instance Document
2.2 Our First Schema
2.3 First Findings
Chapter 3: Giving Some Depth to Our First Schema
3.1 Working From the Structure of the Instance Document
3.2 New Lessons
Chapter 4: Using Predefined Simple Datatypes
4.1 Lexical and Value Spaces
4.2 Whitespace Processing
4.3 String Datatypes
4.4 Numeric Datatypes
4.5 Date and Time Datatypes
4.6 List Types
4.7 What About anySimpleType?
4.8 Back to Our Library
Chapter 5: Creating Simple Datatypes
5.1 Derivation By Restriction
5.2 Derivation By List
5.3 Derivation By Union
5.4 Some Oddities of Simple Types
5.5 Back to Our Library
Chapter 6: Using Regular Expressions to Specify Simple Datatypes
6.1 The Swiss Army Knife
6.2 The Simplest Possible Patterns
6.3 Quantifying
6.4 More Atoms
6.5 Common Patterns
6.6 Back to Our Library
Chapter 7: Creating Complex Datatypes
7.1 Simple Versus Complex Types
7.2 Examining the Landscape
7.3 Simple Content Models
7.4 Complex Content Models
7.5 Mixed Content Models
7.6 Empty Content Models
7.7 Back to Our Library
7.8 Derivation or Groups
Chapter 8: Creating Building Blocks
8.1 Schema Inclusion
8.2 Schema Inclusion with Redefinition
8.3 Other Alternatives
8.4 Simplifying the Library
Chapter 9: Defining Uniqueness, Keys, and Key References
9.1 xs:ID and xs:IDREF
9.2 XPath-Based Identity Checks
9.3 ID/IDREF Versus xs:key/xs:keyref
9.4 Using xs:key and xs:unique As Co-occurrence Constraints
Chapter 10: Controlling Namespaces
10.1 Namespaces Present Two Challenges to Schema Languages
10.2 Namespace Declarations
10.3 To Qualify Or Not to Qualify?
10.4 Disruptive Attributes
10.5 Namespaces and XPath Expressions
10.6 Referencing Other Namespaces
10.7 Schemas for XML, XML Base and XLink
10.8 Namespace Behavior of Imported Components
10.9 Importing Schemas with No Namespaces
10.10 Chameleon Design
10.11 Allowing Any Elements or Attributes from a Particular Namespace
Chapter 11: Referencing Schemas and Schema Datatypes in XML Documents
11.1 Associating Schemas with Instance Documents
11.2 Defining Element Types
11.3 Defining Nil (Null) Values
11.4 Beware the Intrusive Nature of These Features...
Chapter 12: Creating More Building Blocks Using Object-Oriented Features
12.1 Substitution Groups
12.2 Controlling Derivations
Chapter 13: Creating Extensible Schemas
13.1 Extensible Schemas
13.2 The Need for Open Schemas
Chapter 14: Documenting Schemas
14.1 Style Matters
14.2 The W3C XML Schema Annotation Element
14.3 Foreign Attributes
14.4 XML 1.0 Comments
14.5 Which One and What For?
Chapter 15: Elements Reference Guide
Chapter 16: Datatype Reference Guide
XML Schema Languages
What Is a XML Schema Language?
Classification of XML Schema Languages
A Short History of XML Schema Languages
Sample Application
XML DTDs
W3C XML Schema
RELAX NG
Schematron
Examplotron
Decisions
Work in Progress
W3C Projects
ISO: DSDL
Other
Glossary
Colophon

Rezensionen

"Anhand von praxisortientieren Schemata führt der Autor durch das Buch. Es werden ID's, IDRef's, Namespaces ausführlich besprochen. Auch auf den Unterschied von simplen und komplexen Datentypen wird ausführlich eingegangen. Es gibt etliche nützliche Tipps und es wird vor vielen gemeinen Fehlern gewarnt - so wie man es von O'Reilly kennt und schätzt.

Van der VList widmet ein ganzes Kapitel der Dokumentation von XML Schemata. Ein wichtiges Thema, wie ich finde. Es wird gezeigt, wie man ein Schema sauber dokumentiert und dafür sorgt, dass es wartbar bleibt. (...) Gutes Buch um XML Schema zu lernen." -- Leserrezension der Linux User Group Kassel, 04/2005 Lesen Sie die vollständige Rezension unter: http://lug-kassel.de/review/index.html#1