# op:multiply-yearMonthDuration - XPath XQuery Reference

Returns the result of multiplying the value of $arg1 by $arg2.
            The result is rounded to the nearest month.Defines the semantics of the
         "*" operator when applied to an xs:yearMonthDuration and a numeric
         value.The result is the xs:yearMonthDuration whose length in months is equal to
            the result of applying the fn:round function to the value obtained by
            multiplying the length in months of $arg1 by the value of
               $arg2.If $arg2 is positive or negative zero, the result is a zero-length
            duration. If $arg2 is positive or negative infinity, the result overflows
            and is handled as described in . For handling of overflow and underflow, see .op:multiply-yearMonthDuration(xs:yearMonthDuration("P2Y11M"),
                  2.3)xs:yearMonthDuration("P6Y9M")A dynamic error is raised  if $arg2 is
               NaN.Either duration (and therefore the result) may be negative.