;; Examples of data definitions for scalar information

;; An Altitude is represented as a Real, measured in meters

;; A Velocity is represented as a Real, measured in meters/sec upward

;; A BookPrice is represented as a NonNegInt in USD*100 (e.g. $7.95 =>
;; 795)

;; A Vineyard is represented as a String (any string will do)
;; A Vintage  is represented as a positive integer in [1800,2100]