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XPath
XPath 介绍
XPath 节点
XPath 语法
XPath 坐标轴
XPath 操作符
XPath 实例
XPath 摘要
XPath 函数

XPath 操作符


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An XPath expression returns either a node-set, a string, a Boolean, or a number.
XPath 路径表达式的返回值包括:节点集、字符串、布尔值、数字。


XPath Operators
XPath 操作符

Below is a list of the operators that can be used in XPath expressions:
下面给出了XPath表达式的所有操作符:

Operator
操作符
Description
说明
Example
案例
Return value
返回值
| Computes two node-sets
计算两个节点集
//book | //cd Returns a node-set with all book and cd elements
返回所有book元素和cd元素的节点集
+ Addition
6 + 4 10
- Subtraction
6 - 4 2
* Multiplication

6 * 4

24
div Division
8 div 4 2
= Equal
等于
price=9.80 true if price is 9.80
false if price is 9.90
如结果为9.80,则返回true;如结果为9.90,则返回false
!= Not equal
不等于
price!=9.80 true if price is 9.90
false if price is 9.80
如结果为9.90,则返回true;如结果为9.80,则返回false
< Less than
小于
price<9.80 true if price is 9.00
false if price is 9.80
如结果为9.00,则返回true;如结果为9.80,则返回false
<= Less than or equal to
小于等于
price<=9.80 true if price is 9.00
false if price is 9.90
如结果为9.00,则返回true;如结果为9.90,则返回false
> Greater than
大于
price>9.80 true if price is 9.90
false if price is 9.80
如结果为9.90,则返回true;如结果为9.80,则返回false
>= Greater than or equal to
大于等于
price>=9.80 true if price is 9.90
false if price is 9.70
如结果为9.90,则返回true;如结果为9.70,则返回false
or or
price=9.80 or price=9.70 true if price is 9.80
false if price is 9.50
如结果为9.80,则返回true;如结果为9.50,则返回false
and and 
price>9.00 and price<9.90 true if price is 9.80
false if price is 8.50
如结果为9.80,则返回true;如结果为8.50,则返回false
mod Modulus (division remainder)
求模(即:余数)
5 mod 2 1

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