sum()

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The sum() function converts the nodes in the argument node-set to numbers and then totals those numbers.

Syntax:

number sum(node-set) 

Arguments:

Must be a node-set. The nodes are converted to numbers using the rules of the number() function.

Result:

A number, the sum of the values of all the nodes. If any of the nodes cannot be converted into numbers, the result is NaN. If the node-set is empty, the result is zero.

Defined: XPath, section 4.2.

NS support: Supported.