5.3 define-datatype

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(define-datatype datatypeid [variantid fieldid ...] ...)

A short-hand for defining a group of related structures. A define-datatype form

(define-datatype datatypeid
[variantid fieldid ...]
...)

is equivalent to

(define (datatypeid? x)
(or (variantid? x) ...))
(define-struct variantid (fieldid ...))
...

1	Beginning Student
2	Beginning Student with List Abbreviations
3	Intermediate Student
4	Intermediate Student with Lambda
5	Advanced Student
	Index