define-struct

• (define-struct NAME (NAME ...))
  The define-struct form is used to define a new kind of structure. The structure's fields are named by the names in parentheses. After evaluation of a define-struct form, a set of new procedures is available for creation, extraction, and type-like queries:
  • make-<struct-name> : takes a number of arguments equal to the number of fields in the structure, and creates a new instance of this structure.
  • <struct-name>-<field-name> : takes an instance of the structure and returns the field named by <field-name>.
  • <struct-name>? : takes any value, returns true if the value is an instance of the structure.
  It is an error for any of the created names to be the same as a primitive or another user definition.
• (define-struct (NAME NAME) (NAME ...))
  

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