321 Former Publication Frequency (R) (Variable Data Field)
Field 321 contains the former publication frequency of either an item or an update to an item. It is used only when a current publication frequency is given in field 310 (Current Publication Frequency).
The phrase frequency varies may be used in field 321 when more than three past frequencies are known. If subfield $a contains the phrase frequency varies, subfield $b contains the inclusive date for the frequencies.
The National level record requirement for this field is Optional.
Field 321 is repeatable.
Guidelines for applying content designators:
For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:
Position |
Description |
NLR |
MLR |
Repeatability |
Field 321 |
Former Publication Frequency |
O |
O |
R |
Indicator: |
|
|
|
|
First |
Undefined; contains a blank |
M |
|
|
Second |
Undefined; contains a blank |
M |
|
|
|
|
|
|
|
Subfield code: |
|
|
|
|
$a |
M |
O |
NR |
|
$b |
A |
O |
NR |
|
$0 |
|
|
NR |
|
$1 |
|
|
R |
|
$2 |
|
|
NR |
|
$6 |
A |
O |
NR |
|
$8 |
O |
O |
R |
Subfield $0 - Authority record control number or standard number [new, 2020]
Subfield $1 - Real World Object URI [new, 2020]
Subfield $2 - Source [new, 2020]
Related MARC fields or documents:
310 Current Publication Frequency
880 Alternate Graphic Representation
See also: