sum

The sum() function calculates the total of a sequence of numeric values or durations.

For example, if the context node is the element <rect x="20" y="30"/> , then the expression «sum(@*) » returns 50 .

Argument	Data Type	Meaning
sequence	xdt:anyAtomicType*	The set of items to be totaled
zero-value (optional)	xdt:anyAtomicType	The value to be returned when the sequence is empty
Result	xdt:anyAtomicType	The total of the values in the sequence