# 22. Virtuoso Functions Guide - sum

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Functions Index

## sum

Returns sum of all its arguments
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

    sum(/bill[@type="sale"]/total,/bill[@type="leasing"]/income)

See Also

avg max min