1.5.1.6.2 Identifier
When used in a syntax diagram in this manual, the term identifier refers to a valid combination of a data-name or function-identifier with its qualifiers, subscripts, and reference-modifiers as required for uniqueness of reference. Rules for identifiers associated with a format can, however, specifically prohibit qualification, subscripting, or reference-modification.
The term data-name refers to a name that must not be qualified, subscripted, or reference modified, unless specifically permitted by the rules for the format.
- For a description of qualification, see "Qualification" in topic 1.5.1.1.
- For a description of subscripting, see "Subscripting" in topic 1.5.1.8.
- For a description of reference modification, see "Reference
Modification" in topic 1.5.1.9.
___ Format 1 ___________________________________________________________
| |
| <_________________________ |
| >>__data-name-1____ _____________________ _|_________________________> |
| |_ _IN_ __data-name-2_| |
| |_OF_| |
| |
| <_____________________ |
| >__ _____________________ ____ _________________ _|__________________> |
| |_ _IN_ __file-name-1_| |_(__subscript__)_| |
| |_OF_| |
| |
| >__ ________________________________________________ _______________>< |
| |_(__leftmost-character-position:__ ________ __)_| |
| |_length_| |
| |
|________________________________________________________________________|
- data-name-1, data-name-2
-
Can be a record-name.
- file-name-1
-
Must be identified by an FD or SD entry in the Data Division.
File-name-1 must be unique within this program.
___ Format 1 ___________________________________________________________
| |
| <_________________________ |
| >>__ _condition-name-1_ ____ _____________________ _|________________> |
| |_data-name-1______| |_ _IN_ __data-name-2_| |
| |_OF_| |
| |
| >__ _____________________ __________________________________________>< |
| |_ _IN_ __file-name-1_| |
| |_OF_| |
| |
|________________________________________________________________________|
___ Format 2 ___________________________________________________________
| |
| >>__LINAGE-COUNTER__ _____________________ _________________________>< |
| |_ _IN_ __file-name-2_| |
| |_OF_| |
| |
|________________________________________________________________________|
Must be unique within this program.
Duplication of data-names must not occur in those places where the data-name cannot be made unique by qualification.
In the same program, the data-name specified as the subject of the entry whose level-number is 01 that includes the EXTERNAL clause must not be the same data-name specified for any other data description entry that includes the EXTERNAL clause.
In the same Data Division, the data description entries for any two data items for which the same data-name is specified must not include the GLOBAL clause.
Data Division names that are explicitly referenced must either be uniquely defined or made unique through qualification. Unreferenced data items need not be uniquely defined. The highest level in a data hierarchy must be uniquely named, if referenced. This is a data item associated with a level indicator (FD or SD in the File Section) or with a level-number 01. Data items associated with level-numbers 02 through 49 are successively lower levels of the hierarchy.
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