埋め込みの説明
@1@ : KEY指定項目名
例題
[C3146.cob] 000001 IDENTIFICATION DIVISION. 000002 PROGRAM-ID. C3146. 000003 ENVIRONMENT DIVISION. 000004 INPUT-OUTPUT SECTION. 000005 FILE-CONTROL. 000006 SELECT FILE-1 ASSIGN TO SYS001 000007 ORGANIZATION IS INDEXED 000008 ACCESS MODE IS RANDOM 000009 RECORD KEY IS KEY-REC. 000010 DATA DIVISION. 000011 FILE SECTION. 000012 FD FILE-1. 000013 01 REC-1. 000014 02 KEY-REC PIC XX. 000015 02 FILLER PIC X(78). 000016 WORKING-STORAGE SECTION. 000017 77 KEY-DATA PIC XX. 000018 PROCEDURE DIVISION. 000019 READ FILE-1 KEY IS KEY-DATA. 000020 STOP RUN.
C3146.cob 19: JMN3146I-S READ文のKEY指定のデータ項目 は，主レコードキーまたは副レコードキーとして記述しなければなりません．
