(form "20210" (size 56 11)
  (heading "SPECIFY CLASSIFICATION")
  (label (position  2  3) (text "Group"))
  (label (position 12  3) (text "Classify on"))
  (label (position  2  5) (text "Classification descriptor"))
  (label (position  2  7) (text "Interval for this descriptor"))
  (label (position  4  8) (text "From"))
  (label (position 27  8) (text "To"))
  (field "grpnum" (position  8  3) (display_length  2)
    (background) (input disallowed))
  (field "classatt" (position 22  3) (display_length 26)
    (background) (max_length 30) (input disallowed))
  (field "desc" (position 22  5) (display_length 26) (input allowed)
    (null allowed) (max_length 26))
  (field "from" (position  9  8) (display_length 16) (input allowed)
    (null allowed) (max_length 16))
  (field "to" (position 30  8) (display_length 16) (input allowed)
    (null allowed) (max_length 16))
  (default_buttons)
)