Specifying the Nodes to Evaluate

Consider the bookstore tree in the sample data. If you query the entire tree for all author elements, the result contains a number of author elements. If you query only one branch of the tree, the result contains only one author element. The result of the query depends on which nodes the XPath processor evaluates in the execution of the query.

This section discusses the following topics:

Understanding XPath Processor Terms

Starting at the Context Node

About Root Nodes and Document Elements

Starting at the Root Node

Descending Along Branches

Explicitly Specifying the Current Context

Specifying Children or Descendants of Parent Nodes

Examples of XPath Expression Results

Syntax for Specifying an Axis in a Query

Supported Axes

Axes That Represent the Whole XML Document

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