Leader/20-23 Entry map
The Entry map contains four computer-generated, single-digit numeric characters that indicate the structure of each entry in the Directory.
Users typically do not have access to these Leader positions; the Entry map is automatically generated by the system.
National and minimal level record requirements for Leader/20-23 for all formats are Mandatory.
Position: |
Description: |
Leader/20 |
Length of the length-of-field portion. A character that indicates how many character positions will be used in a Directory entry to store the length of a variable field. In MARC 21, the length-of-field portion of each Directory entry is always 4 character positions in length; Leader/20 always contains a 4 (system-generated). |
Leader/21 |
Length of the starting-character-position portion. In MARC 21, the starting-character-position portion of each Directory entry is always 5 character positions in length; Leader/21 always contains a 5 (system-generated). |
Leader/22 |
Length of the implementation-defined portion. This character is produced by some automated systems and is only defined for that system. In MARC 21, a Directory entry does not contain an implementation-defined portion; Leader/22 always contains a zero (0) (system-generated). |
Leader/23 |
Undefined. In MARC 21, this character position is undefined; Leader/23 always contains a zero (0) (system-generated). |
For information about Leader/20-23 in a specific MARC format, select:
Leader/20-23 Entry map (Authority)
Leader/20-23 Entry map (Bibliographic)
Leader/20-23 Entry map (Classification)
Leader/20-23 Entry map (Community Information)
Leader/20-23 Entry map (Holdings)
To return:
Use the key.