Leader/20-23 Entry map (Leader)
The Entry map character positions contain four computer-generated, single-digit numeric characters that indicate the structure of each entry in the Directory .
Position: Description:
Leader/20 Length of the length-of-field portion. In USMARC, the length-of-field portion of each Directory entry is always 4 character positions in length, so Leader/20 always contains a 4 (system-generated).
Leader/21 Length of the starting-character-position portion. In USMARC, the starting character position portion of each Directory entry is always 5 character positions in length, so Leader/21 always contains a 5 (system-generated).
Leader/22 Length of the implementation-defined portion. In USMARC, a Directory entry does not contain an implementation-defined portion, so Leader/22 always contains a zero (0) (system-generated).
Leader/23 Undefined Entry map character position. In USMARC, this character position is undefined; so Leader/23 always contains a zero (0) (system-generated).
The Leader/20-23 elements are usually system generated.
For information on other Leader character positions, select:
