Returns the sum of two xs:dayTimeDuration values.
xs:dayTimeDuration values.op:add-dayTimeDurations( $arg1 as xs:dayTimeDuration,$arg2 as xs:dayTimeDurationxs:dayTimeDurationThe function returns the result of adding the value of $arg1 to the value
of $arg2. The result is the xs:dayTimeDuration whose length in
seconds is equal to the sum of the length in seconds of the two input durations.
For handling of overflow, see .
The expression op:add-dayTimeDurations(xs:dayTimeDuration("P2DT12H5M"),
xs:dayTimeDuration("P5DT12H")) returns xs:dayTimeDuration('P8DT5M').
Either duration (and therefore the result) may be negative.
