XPath Examples-优快云博客

本文通过实例介绍了XPath的基本语法，展示了如何使用XPath选择XML文档中的节点，包括选取所有书籍节点、特定条件下的节点等。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

XPath Examples

Let's try to learn some basic XPath syntax by looking at some examples.

The XML Example Document

We will use the following XML document in the examples below.

"books.xml":

<?xml version="1.0" encoding="ISO-8859-1"?>

<bookstore>

<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>

<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>

<book category="WEB">
  <title lang="en">XQuery Kick Start</title>
  <author>James McGovern</author>
  <author>Per Bothner</author>
  <author>Kurt Cagle</author>
  <author>James Linn</author>
  <author>Vaidyanathan Nagarajan</author>
  <year>2003</year>
  <price>49.99</price>
</book>

<book category="WEB">
  <title lang="en">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>

</bookstore>

View the "books.xml" file in your browser.

Selecting Nodes

We will use the Microsoft XMLDOM object to load the XML document and the selectNodes() function to select nodes from the XML document:

set xmlDoc=CreateObject("Microsoft.XMLDOM")
xmlDoc.async="false"
xmlDoc.load("books.xml")

xmlDoc.selectNodes(path expression)

Select all book Nodes

The following example selects all the book nodes under the bookstore element:

xmlDoc.selectNodes("/bookstore/book")

If you have IE 5 or higher you can try it yourself.

Select the First book Node

The following example selects only the first book node under the bookstore element:

xmlDoc.selectNodes("/bookstore/book[0]")

If you have IE 5 or higher you can try it yourself

Note: IE5 and later has implemented that [0] should be the first node, but according to the W3C standard it should have been [1]!!

A Workaround!

To solve the [0] and [1] problem in IE5+, you can set the SelectionLanguage to XPath.

The following example selects only the first book node under the bookstore element:

xmlDoc.setProperty "SelectionLanguage", "XPath"
xmlDoc.selectNodes("/bookstore/book[1]")

Try it yourself

Select the prices

The following example selects the text from all the price nodes:

xmlDoc.selectNodes("/bookstore/book/price/text()")

If you have IE 5 or higher you can try it yourself.

Selecting price Nodes with Price>35

The following example selects all the price nodes with a price higher than 35:

xmlDoc.selectNodes("/bookstore/book[price>35]/price")

If you have IE 5 or higher you can try it yourself.

Selecting title Nodes with Price>35

The following example selects all the title nodes with a price higher than 35:

xmlDoc.selectNodes("/bookstore/book[price>35]/title")

If you have IE 5 or higher you can try it yourself.