XPath 操作符

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。

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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 | //cdReturns 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
加6 + 410-Subtraction
减6 - 42*Multiplication
乘

6 * 4

24divDivision
除8 div 42=Equal
等于price=9.80true 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!=9.80true 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<9.80true 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<=9.80true 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>9.80true 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>=9.80true 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falseoror
或price=9.80 or price=9.70true 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falseandand 
与price>9.00 and price<9.90true 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falsemodModulus (division remainder)
求模（即：余数）5 mod 21