XPath 语法
2007-06-05 17:24
XPath 语法
作者:w3pop.com 翻译/整理:w3pop.com 发布:2007-04-29 浏览:674 :: ::
XPath Nodes(节点) XPath Axes
XPath uses path expressions to select nodes or node-sets in an XML document. The node is selected by following a path or steps.
XPath 通过路径表达式从XML文档中选取节点或节点设置。可以通过一条语句或相应的步骤选取一个节点。
The XML Example Document
XML文档实例
We will use the following XML document in the examples below.
我们将在接下来的文章中引用这个XML文档。
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book>
<title lang="eng">Harry Potter</title>
<price>29.99</price>
</book>
<book>
<title lang="eng">Learning XML</title>
<price>39.95</price>
</book>
</bookstore>
Selecting Nodes
选取节点
XPath uses path expressions to select nodes in an XML document. The node is selected by following a path or steps. The most useful path expressions are listed below:
XPath通过路径表达式在XML文档中选取节点。可以通过一条语句或相应的步骤选取一个节点。下面列出了最常使用的路径表达式：
Expression
表达式
Description
注释
nodename
Selects all child nodes of the node
选取节点下的所有子节点
/
Selects from the root node
选取根节点
//
Selects nodes in the document from the current node that match the selection no matter where they are
选取文档中所有符合条件的节点，不管该节点位于何处
.
Selects the current node
选取当前节点
..
Selects the parent of the current node
选取单前节点的父节点
@
Selects attributes
选取属性
Examples
实例
In the table below we have listed some path expressions and the result of the expressions:
在下面的表格中，我们列出了一些路径表达式及其运行的结果：
Path Expression
表达式
Result
结果
bookstore
Selects all the child nodes of the bookstore element
选取bookstore元素的所有子节点
/bookstore
Selects the root element bookstore
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