Chapter 9 Writing XPath Expressions

The XPath processor allows you to retrieve a subset of an XML document. A query, which is always an XPath expression, returns a well-formed XML node-list or an XPath value object. In XPath 2.0, an expression returns a sequence of XML nodes and/or XPath value objects.

This section discusses the following topics:

About the XPath Processor

Sample Data for Examples and Testing

Getting Started with Queries

Specifying the Nodes to Evaluate

Handling Strings and Text

Specifying Boolean Expressions and Functions

Specifying Number Operations and Functions

Comparing Values

Finding a Particular Node

Obtaining a Union

Obtaining Information About a Node or a Node Set

Using XPath Expressions in Stylesheets

Accessing Other Documents During Query Execution

XPath Quick Reference

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Chapter 9 Writing XPath Expressions

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Introduction to the XQuery Mapper

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