> As to the ERROR-IS codes, they don't have to be complicated.  When an
> error condition is detected, they would be an OPTIONAL way to further
> describe the error.  The only requirement would be that no fales
> descriptions be sent.  The coding can be structured with varying amounts
> of information.  Whatever follows the number can be text taken as a
> comment.
 
What will programs do with this information about the cause of the
error?  It seems to me that the only reason for putting such
information into a header is that a program might process it in some
way.  A person can see what the error was by reading the text of the
rejection notice.