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.

Field 654 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position

Description

Repeatability

Field 654

Subject Added Entry - Faceted Topical Terms

R

Indicator:

 

 

First

Level of subject

 

#

No information provided

 

0

No level specified

 

1

Primary

 

2

Secondary

 

 

 

 

Second

Undefined; contains a blank

 

 

 

 

Subfield code:

 

 

$a

Focus term

NR

$b

Non-focus term

R

$c

Facet/hierarchy designation

R

$v

Form subdivision

R

$y

Chronological subdivision

R

$z

Geographic subdivision

R

$0

Authority record control number

R

$2

Source of heading or term

NR

$3

Materials specified

NR

$6

Linkage

NR

$8

Field link and sequence number

R

Input conventions:

Punctuation

Display constant

Content designator history:

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

Related MARC field or document:

Source Codes for Vocabularies, Rules, and Schemes:

Subject Heading and Term Source Codes

See also:

6XX  Subject Access Fields

Variable Data Fields