Distance = (Abs ?(A : I|F)) - ?(B : I|F)
Distance = (Abs ?(A : Date)) - ?(B : Date), DT_DAYS
Distance = (Abs ?(A : Time)) - ?(B : Time), DT_MILLISECONDS
Distance = (1 - (StrLike ?(A : String))) ?(B : String) )
Distance = Sqrt (?(A : RGBColor).Red - ?(B : RGBColor).Red) ^ 2 +
                (A.Green             - B.Green            ) ^ 2 +
                (A.Blue              - B.Blue             ) ^ 2