fn:sum function

Syntax

>>-fn:sum(sequence-expression)---------------------------------><

sequence-expression

A sequence that contains items of any of the following atomic types, or an empty sequence:

• xs:double
• xs:decimal
• xs:integer
• A type that is derived from any of the previously listed types
• xs:dayTimeDuration
• xs:yearMonthDuration
• xs:untypedAtomic

All values in the sequence must be of the same type or a derived type of the type, or must be promotable to a single common type. An xs:untypedAtomic value is promoted to the xs:double data type. A derived type is promoted to its direct parent data type.

Returned value

If sequence-expression is not the empty sequence, the returned value is the sum of the values in sequence-expression. The data type of the returned value is the same as the data type of the items in sequence-expression, or the data type to which the items in sequence-expression are promoted.

If sequence-expression is the empty sequence, fn:sum returns 0.0E0.

Example

The following function returns the sum of the sequence (5, 1.0E2, 4.5):

fn:sum(5, 1.0E2, 40.5)

The values are promoted to the xs:double data type. The returned value is 1.455E2.