Field definition and scope:

Field 654 contains a topical subject constructed from a faceted vocabulary.

For each term found in the field, an identification is given as to the facet/hierarchy in the thesaurus from which the term came.  In addition, identification is given as to which term is the focus term of the expression.  A field may contain more than one expression.

The National level record requirement for this field is Mandatory if applicable.

Field 654 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 654

Subject Added Entry - Faceted Topical Terms

A

O

R

Indicator:

 

 

 

 

First

Level of subject

M

 

 

#

No information provided

A

 

 

0

No level specified

A

 

 

1

Primary

A

 

 

2

Secondary

A

 

 

 

 

 

 

 

Second

Undefined; contains a blank

M

 

 

 

 

 

 

 

Subfield code:

 

 

 

 

$a

Focus term

A

O

R

$b

Non-focus term

A

O

R

$c

Facet/hierarchy designation

A

O

R

$e

Relator term

O

O

R

$v

Form 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 heading or term

A

O

NR

$3

Materials specified

O

O

NR

$4

Relationship

O

O

R

$6

Linkage

A

O

NR

$8

Field link and sequence number

O

O

R

Input conventions:

Punctuation

Display constant

Content designator history:

Subfield $e - Relator term  [new, 2005]

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

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

Subfield $4 - Relator code  [new, 2005]

Subfield $4 - Relator code  [renamed, 2017] [redescribed, 2017]:  Subfield $4 was renamed to Relationship and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.

Related MARC fields or documents:

MARC Code List for Relators

Source Codes for Vocabularies, Rules, and Schemes:

Subject Heading and Term Source Codes

See also:

6XX  Subject Access Fields

Variable Data Fields