Library of Congress >> MARC >> Bibliographic >> 6XX  >> 654

654 - Subject Added Entry-Faceted Topical Terms (R)


MARC 21 Bibliographic - full
May 2017

First Indicator Second Indicator
Level of subject
# - No information provided
0 - No level specified
1 - Primary
2 - Secondary

Undefined
# - Undefined


Subfield Codes
  • $a - Focus term (R)
  • $b - Non-focus term (R)
  • $c - Facet/hierarchy designation (R)
  • $e - Relator term (R)
  • $v - Form subdivision (R)
  • $y - Chronological subdivision (R)
  • $z - Geographic subdivision (R)
  • $0 - Authority record control number or standard number (R)
  • $2 - Source of heading or term (NR)
  • $3 - Materials specified (NR)
  • $4 - Relationship (R)
  • $6 - Linkage (NR)
  • $8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

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.


GUIDELINES FOR APPLYING CONTENT DESIGNATORS

INDICATORS

First Indicator - Level of subject

Used to distinguish primary and secondary descriptors.

# - No information provided
0 - No level specified

Level of the subject expression or string could be determined but is not specified.

654 0#$cr$alandscape gardens$cy$b18th century$cz$bEngland.$2aat
1 - Primary

Main focus or subject content of the material.

654 1#$ck$ainterior design.$2aat
2 - Secondary

Less important aspect of the content of the material.

654 2#$cr$ahousing.$2aat

Second Indicator - Undefined

Undefined and contains a blank (#).

SUBFIELD CODES

$a - Focus term

Concrete thing, being, idea, or activity forming the basis of the expression. The subfield is repeated when there is more than one expression in the field.

654 ##$cm$alimestone.$2aat
654 ##$cf$bFrench colonial$cv$aportraits$cz$bUnited States$cz$bNew Jersey.$2aat
[The focus term in the AAT expression is "portraits."]
654 ##$cf$bRomanesque$cm$bstone$cr$achurches$ck$arenovation.$2aat

$b - Non-focus term

Term other than that considered the focus.

654 ##$cm$bcharcoal$cv$adrawings$cz$bGreat Britain$cy$b18th century.$2aat

$c - Facet/hierarchy designation

Designation used by the thesaurus specified by the MARC code contained in subfield $2 to identify the facet/hierarchy for each term contained in subfields $a and $b.

Designations differ, depending on the subject heading thesaurus used (as specified by the code found in subfield $2).Subfield $c always precedes the data to which it is associated.

654 ##$cr$ahousing$cz$bUnited States.$2aat
654 ##$cd$bblue$cf$bBaroque$ct$apitchers$2aat

$e - Relator term

Designation of the relationship between a subject expression or string and the described materials, e.g., depicted.

$v - Form subdivision

Form subdivision that designates a specific kind or genre of material as defined by the thesaurus being used. Subfield $v is appropriate only when a form subject subdivision is added to a faceted topical term.

$y - Chronological subdivision

Subject subdivision that represents a period of time. Subfield $y is appropriate only when a chronological subject subdivision is added to a main term.

654 0#$cr$alandscape$y18th century$zEngland.$2aat

$z - Geographic subdivision

Geographic subject subdivision. Subfield $z is appropriate in field 654 only when a geographic subject subdivision is added to a main term.

654 0#$cr$alandscape$y18th century$zEngland.$2aat

$0 - Authority record control number or standard number

See description of this subfield in Appendix A: Control Subfields.

$2 - Source of heading or term

MARC code that identifies the source list from which the subject expression or string was assigned. Code from: Subject Heading and Term Source Codes.

654 ##$cr$acountry houses$cz$bGreat Britain$cy$b18th century.$2aat
654 ##$cv$aguidebooks.$2aat
654 ##$cv$abibliographies.$2aat

$3 - Materials specified

Part of the collection, etc. to which the field applies.

654 ##$3business letters$cr$ahousing$cz$bUnited States.$2aat

$4 - Relationship

Code or URI that specifies the relationship from the entity described in the record to the entity referenced in the field. A source of relationship code is: MARC Code List for Relators.

$6 - Linkage

See description of this subfield in Appendix A: Control Subfields.

$8 - Field link and sequence number

See description of this subfield in Appendix A: Control Subfields.


INPUT CONVENTIONS

Punctuation - Subfield preceding subfield $2 in field 654 ends with a mark of punctuation or a closing parenthesis.

Display Constant

- [dash]

Dash (-) that precedes some terms in a display is not carried in the machine-readable record. It may be system generated as a display constant associated with the content of subfields $a, $b, $v, $y, and $z.


CONTENT DESIGNATOR HISTORY

$e - Relator term [NEW, 2005]
$0 - Authority record control number [NEW, 2007]
$0 - Authority record control number [REDEFINED, 2010]
$4 - Relator code [NEW, 2005]
$4 - Relator code [RENAMED, 2017] [REDESCRIBED, 2017]

Subfield $4 was renamed and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.


Library of Congress >> MARC >> Bibliographic >> 6XX  >> 654
(05/17/2017)
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