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
               )
