Re: Rounding errors in financial app transforms

> Financial systems (at least all the ones we have dealt with) use have a
> specific way or rounding money known as "bankers rounding" or "half even
> rounding".

many humans were taught that way as well (I was certainly aught that as
a child) xpath2 has a default rounding function that provides half-even
rounding, which is of course designed to mininmimise rounding errors (as
half the time you round up, and half down, so on balance for many types
of calculation the expected error is less with this rounding method.



> The problem value is the n.5. Most mathematics based system (and most
> humans) including both versions of XSLT round to n+1. 
> 

http://www.w3.org/TR/xpath-functions/#func-round-half-to-even

David


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