Cataloger's Reference Shelf
MARC 21 Format for Bibliographic Data
Cataloger's Reference Shelf
MARC 21 Format for Bibliographic Data
657 Index Term - Function (R) (Variable Data Field)
Field 657 contains index terms that describe the activity or function that generated the described materials.
Standard published lists are used for the function terms and the list is identified in subfield $2 (Source of term).
The National level record requirement for this field is Optional.
Field 657 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 657 |
Index Term - Function |
O |
O |
R |
Indicator: |
|
|
|
|
First |
Undefined; contains a blank |
M |
|
|
|
|
|
|
|
Second |
M |
|
|
|
7 |
A |
|
|
|
|
|
|
|
|
Subfield code: |
|
|
|
|
$a |
M |
O |
NR |
|
$v |
A |
O |
R |
|
$x |
A |
O |
R |
|
$y |
A |
O |
R |
|
$z |
A |
O |
R |
|
$0 |
O |
O |
R |
|
$1 |
|
|
R |
|
$2 |
M |
O |
NR |
|
$3 |
O |
O |
NR |
|
$6 |
A |
O |
NR |
|
$8 |
O |
O |
R |
Subfield
$0 - Authority
record control number [new,
2007]
Subfield
$0 - Authority
record control number [redefined,
2010]
Subfield $1 - Real
World Object URI [new, 2017]
Related MARC fields or documents:
880 Alternate Graphic Representation
Source Codes for Vocabularies, Rules, and Schemes:
See also: