Table of contents

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2 Basic Concepts: The Purchase Order

2.1 The Purchase Order Schema

2.2 Complex Type Definitions, Element & Attribute Declarations

2.2.1 Occurrence Constraints

2.2.2 Global Elements & Attributes

2.2.3 Naming Conflicts

2.3 Simple Types

2.3.1 List Types

2.3.2 Union Types

2.4 Anonymous Type Definitions

2.5 Element Content

2.5.1 Complex Types from Simple Types

2.5.2 Mixed Content

2.5.3 Empty Content

2.5.4 anyType

2.6 Annotations

2.7 Building Content Models

2.8 Attribute Groups

2.9 Nil Values

3 Advanced Concepts I: Namespaces, Schemas & Qualification

3.1 Target Namespaces & Unqualified Locals

3.2 Qualified Locals

3.3 Global vs. Local Declarations

3.4 Undeclared Target Namespaces

4 Advanced Concepts II: The International Purchase Order

4.1 A Schema in Multiple Documents

4.2 Deriving Types by Extension

4.3 Using Derived Types in Instance Documents

4.4 Deriving Complex Types by Restriction

4.5 Redefining Types & Groups

4.6 Substitution Groups

4.7 Abstract Elements and Types

4.8 Controlling the Creation & Use of Derived Types

5 Advanced Concepts III: The Quarterly Report

5.1 Specifying Uniqueness

5.2 Defining Keys & their References

5.3 XML Schema Constraints vs. XML 1.0 ID Attributes

5.4 Importing Types

5.4.1 Type Libraries

5.5 Any Element, Any Attribute

5.6 schemaLocation

5.7 Conformance

Appendices

A Acknowledgements

B Simple Types & their Facets

C Using Entities

D Regular Expressions

E.1 XML Schema Elements

E.2 XML Schema Attributes

4 Advanced Concepts II: The International Purchase Order

Advanced Concepts II: The International Purchase Order

The purchase order schema described in [Basic Concepts: The Purchase Order] was contained in a single document, and most of the schema constructions-- such as element declarations and type definitions-- were constructed from scratch. In reality, schema authors will want to compose schemas from constructions located in multiple documents, and to create new types based on existing types. In this section, we examine mechanisms that enable such compositions and creations.

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