| First Indicator | Second Indicator |
|---|---|
| Level of subject # - No information provided 0 - No level specified 1 - Primary 2 - Secondary |
Undefined # - Undefined |
| Subfield Codes | |
|---|---|
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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.
First Indicator - Level of subject
Used to distinguish primary and secondary descriptors.
Level of the subject expression or string could be determined but is not specified.
| 654 | 0#$cr$alandscape gardens$cy$b18th century$cz$bEngland.$2aat | ||||||||
Main focus or subject content of the material.
| 654 | 1#$ck$ainterior design.$2aat | ||||||||
Less important aspect of the content of the material.
| 654 | 2#$cr$ahousing.$2aat | ||||||||
Second Indicator - Undefined
Undefined and contains a blank (#).
$a - Focus term
Concrete thing, being, idea, or activity forming the basis of the expression. The subfield is repeated when there is more than one expression in the field.
| 654 | ##$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.
$1 - Real World Object URI
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.
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.
Subfield $4 was renamed and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.