Field definition and scope:

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

Source of term

M

 

 

7

Source specified in subfield $2

A

 

 

 

 

 

 

 

Subfield code:

 

 

 

 

$a

Function

M

O

NR

$v

Form subdivision

A

O

R

$x

General subdivision

A

O

R

$y

Chronological subdivision

A

O

R

$z

Geographic subdivision

A

O

R

$0

Authority record control number or standard number

O

O

R

$2

Source of term

M

O

NR

$3

Materials specified

O

O

NR

$6

Linkage

A

O

NR

$8

Field link and sequence number

O

O

R

Input conventions:

Punctuation

Spacing

Display constant

Content designator history:

Subfield $0 - Authority record control number  [new, 2007]

Subfield $0 - Authority record control number  [redefined, 2010]

Related MARC fields or documents:

880  Alternate Graphic Representation

Source Codes for Vocabularies, Rules, and Schemes:

Function Term Source Codes

See also:

6XX  Subject Access Fields

Variable Data Fields