Name
sum — Returns sum of all its arguments
Synopsis
number
sum
(
|
arg1 any , |
| arg2 any , | |
| ... , | |
argN
any
); |
Description
The function returns the sum, for each node in every argument node-set, of the result of converting the string-values of the node to a number. If some arguments are not node-sets, they are converted to numbers first.
Note that this definition differs from XPATH 1.0 standard, where sum() function must have exactly one argument of type node-set. It is important that other XPATH processors may quietly ignore all arguments except the first one, producing unexpected results.
Being called without arguments, sum() will return zero.
Parameters
argI
A node-set of nodes whose string values must be converted to numbers and added to the result, or single value.
Return Types
Examples
Example 24.626.
sum(/bill[@type="sale"]/total,/bill[@type="leasing"]/income)