User-written edit modules for the CA IDMS mapping facility are not CA IDMS/DC. exits; CA IDMS/DC controls the execution of the user-written edit module.
Since user-written edit modules are considered subroutines by Runtime mapping, they do not receive storage protection in the same manner as application programs. It is advisable to conform to the register usage demonstrated in this appendix when coding and testing user edit modules so that user edit modules do not modify system storage areas.
The following points, which are discussed separately, should be considered when planning a user-written edit module for mapin or mapout operations:
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