- (define-record-type NAME (CONSTRUCTOR TAG ...) PREDICATE (FIELD ACCESSOR [MODIFIER]) ...)syntax
SRFI-9 record types. For more information see the documentation for SRFI-9.
As an extension the MODIFIER may have the form (setter PROCEDURE), which will define a SRFI-17 setter-procedure for the given PROCEDURE that sets the field value. Usually PROCEDURE has the same name is ACCESSOR (but it doesn't have to).
This special form is also compatible with the definition from the R7RS (scheme base) library.