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5.3.4 Level-Numbers
The level-number specifies the hierarchy of data within a record, and identifies special-purpose data entries. A level-number begins a data description entry, a renamed or redefined item, or a condition-name entry. A level-number has a value taken from the set of integers between 1 and 49, or from one of the special level-numbers, 66, 77, or 88. 



    ___ Format _____________________________________________________________ 
   |                                                                        |
   | >>__level-number__ _____________ ___________________________________>< |
   |                   |_data-name-1_|                                      |
   |                   |_FILLER______|                                      |
   |                                                                        |
   |________________________________________________________________________|
level-number
01 and 77 must begin in Area A and must be followed either by a separator period; or by a space, followed by its associated data-name, FILLER, or appropriate data description clause.
Level numbers 02 through 49 can begin in Areas A or B and must be followed by a space or a separator period.
Level numbers 66 and 88 can begin in Areas A or B and must be followed by a space.
Single-digit level-numbers 1 through 9 can be substituted for level-numbers 01 through 09.
Successive data description entries can start in the same column as the first or they can be indented according to the level-number. Indentation does not affect the magnitude of a level-number.
When level-numbers are indented, each new level-number can begin any number of spaces to the right of Area A. The extent of indentation to the right is limited only by the width of Area B.
For more information, see "Levels of Data" in topic 5.1.6.1
data-name
Explicitly identifies the data being described.
If specified, a data-name identifies a data item used in the program. The data-name must be the first word following the level-number.
The data item can be changed during program execution.
Data-name must be specified for level-66 and level-88 items. It must also be specified for any entry containing the GLOBAL or EXTERNAL clause, and for record description entries associated with file description entries having the GLOBAL or EXTERNAL clauses.
FILLER
Is a data item that is not explicitly referred to in a program. The key word FILLER is optional. If specified, FILLER must be the first word following the level-number.
The key word FILLER can be used with a conditional variable, if explicit reference is never made to the conditional variable but only to values it can assume. FILLER cannot be used with a condition-name.
In a MOVE CORRESPONDING statement, or in an ADD CORRESPONDING or SUBTRACT CORRESPONDING statement, FILLER items are ignored. In an INITIALIZE statement, elementary FILLER items are ignored.
If the data-name or FILLER clause is omitted, the data item being described is treated as though FILLER had been specified.

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