This sample ADATA exit uses parameters specified on the assembler EXIT option to determine if it, or the assembler, is to perform output processing for the associated data records, and which record types are to be kept or discarded. The exit accepts records from the assembler, from either a PROCESS request or a WRITE request, and it decides whether the record should be discarded, output, or modified and then output. The exit then decides if an additional record should be inserted, and if so it builds the new record.

For a PROCESS request the exit sets the appropriate flags and returns to allow the assembler to perform the output processing. For a WRITE request the exit performs the output processing itself.