# fn:seconds-from-duration - XPath XQuery Reference

Returns the number of seconds in a duration.deterministiccontext-independentfocus-independentIf $arg is the empty sequence, the function returns the empty sequence.Otherwise, the function returns an xs:decimal representing the seconds
            component in the value of $arg. Given that a duration
               is a ($months, $seconds) tuple, the result is the value of ($seconds mod 60)
            as an xs:decimal.If $arg is a negative duration then the result will be negative.If $arg is an xs:yearMonthDuration the function returns 0.fn:seconds-from-duration(xs:dayTimeDuration("P3DT10H12.5S"))12.5fn:seconds-from-duration(xs:dayTimeDuration("-PT256S"))-16.0