With the XQuery 1.0 language, database developers finally have a tool that will make it much easier to exchange information between XML and relational data sources. This in- depth tutorial not only walks them through the XQuery specification, but also teaches them how to program with this widely-anticipated language. Whether database developers are coming from SQL, XSLT, or starting from scratch, they will learn about XQuery's support for filtering, sorting, and grouping data, as well as how to use FLWR expressions, XPath, and XQuery tools for extracting and combining information. Readers will discover how to apply all of these tools to a wide variety of data sources, and how to recombine information from multiple sources into a single final output result. "XQuery" also delves into critical advanced issues such as data typing and designing efficient query logic.

Preface
Introduction to XQuery
What Is XQuery?
Easing into XQuery
Path Expressions
FLWORs
Adding XML Elements and Attributes
FunctionsJoins
Aggregating and Grouping Values
XQuery Foundations
The Design of the XQuery LanguageX
Query in Context
Processing Queries
The XQuery Data Model
TypesNamespaces
Expressions: XQuery Building Blocks
Categories of Expressions
Keywords and Names
Whitespace in QueriesLiterals
Variables
Function Calls
Comments
Evaluation Order and Parentheses
Comparison Expressions
Conditional (if-then-else) Expressions
Logical (and/or) Expressions
Navigating Input Documents Using Paths
Path ExpressionsPredicates
Dynamic Paths
Input Documents
A Closer Look at Context
Adding Elements and Attributes to Results
Including Elements and Attributes from the Input Document
Direct Element Constructors
Computed Constructors
Selecting and Joining Using FLWORs
Selecting with Path Expressions
FLWOR Expressions
Quantified Expressions
Selecting Distinct Values
Joins
Sorting and Grouping
Sorting in XQuery
Grouping
Aggregating Values
Functions
Built-in Versus User-Def ined Functions
Calling Functions
User-Defined Functions
Advanced Queries
Copying Input Elements with Modifications
Working with Positions and Sequence Numbers
Combining Results
Using Intermediate XML Documents
Namespaces and XQuery
XML Namespaces
Namespaces and XQuery
Namespace Declarations in Queries
Controlling Namespace Declarations in Your Results
A Closer Look at Types
The XQuery Type System
The Built-in Types
Types, Nodes, and Atomic Values
Type Checking in XQuery
Automatic Type Conversions
Sequence Types
Constructors and Casting
Queries, Prologs, and Modules
Structure of a Query: Prolog and Body
Assembling Queries from Multiple Modules
Variable Declarations
Declaring External Functions
Using Schemas with XQuery
What Is a Schema?
Why Use Schemas with Queries?W3C XML Schema: A Brief Overview
In-Scope Schema Definitions
Schema Validation and Type Assignment
Sequence Types and Schemas
Static Typing
What Is Static Typing?
The Typeswitch Expression
The Treat Expression
Type Declarations
The zero-or-one, one-or-more, and exactly-one Functions
Principles of Query Design
Query Design Goals
Clarity
Modularity
RobustnessError Handling
Performance
Working with Numbers
The Numeric Types
Constructing Numeric Values
Comparing Numeric Values
Arithmetic Operations
Functions on Numbers
Working with Strings
The xs:string Type
Constructing Strings
Comparing Strings
Substrings
Finding the Length of a String
Concatenating and Splitting Strings
Manipulating Strings
Whitespace and Strings
Internationalization Considerations
Regular Expressions
The Structure of a Regular Expression
Representing Individual Characters
Representing Any Character
Representing Groups of Characters
Character Class Expressions
Reluctant Quantifiers
AnchorsBack-References
Using FlagsUsing Sub-Expressions with Replacement Variables
Working with Dates, Times, and Durations
The Date and Time Types
The Duration Types
Extracting Components of Dates, Times, and Durations
Using Arithmetic Operators on Dates, Times, and Durations
The Date Component Types
Working with Qualified Names, URIs, and IDs
Working with Qualified Names
Working with URIs
Working with IDs
Working with Other XML Components
XML Comments
Processing Instructions
Documents
Text Nodes
XML Entity and Character References
CDATA Sections
Additional XQuery-Related Standards
SerializationXQueryXXQuery Update Facility
Full-Text SearchXQuery API for Java (XQJ)
Implementation-Specific Features
ConformanceXML Version Support
Setting the Query Context
Option Declarations and Extension Expressions
Specifying Serialization Parameters
XQuery for SQL Users
Relational Versus XML Data Models
Comparing SQL Syntax with XQuery Syntax
Combining SQL and XQuerySQL/XML
XQuery for XSLT UsersXQuery and XPathXQuery Versus XSLT
Differences Between XQuery 1.0/XPath 2.0 and XPath 1.0
Built-in Function Reference
Built-in Types
Error Summary
Index
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