The `sum`

function returns a number that is the sum of the numeric values of each node in a given node-set.

sum(node-set )

`node-set`

- The node-set to be evaluated. Each node in this node-set is evaluated as if it were passed to the number() function, and a sum of the resulting numbers is returned.

A number.

*(None)*

Supported.

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https://developer.mozilla.org/en-US/docs/Web/XPath/Functions/sum