654 - Subject Added Entry-Faceted Topical Terms (R)
MARC 21 Community Information - Full
October 2007
First Indicator Level of subject # - No information provided 0 - No level specified 1 - Primary 2 - Secondary
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Second Indicator Undefined # - Undefined
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Subfield Codes
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$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)
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$0 - Authority record control number (R)
$2 - Source of heading or term (NR) $3 - Materials specified (NR) $6 - Linkage (NR) $8 - Field link and sequence number (R) |
FIELD DEFINITION AND SCOPE
Topical subject entry constructed from a faceted vocabulary.
For each term found in the field, an identification is given as to the facet/hierarchy
in the thesaurus from which the term came. In addition, identification is given as to
which term is the focus term of the expression. A field may contain more than one
expression.
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
■ INDICATORS
First Indicator - Level of subject Level of the subject expression or string. This indicator is used to distinguish
primary and secondary descriptors.
# - No information provided No information as to the level of the subject expression or string is
provided.
0 - No level specified Level of the subject expression or string could be determined but is not
specified.
Heading: landscape gardens-18th century-United States-Virginia-Charlottesville
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654 |
0#$cob$alandscape gardens$cy$b18th century$cz$bUnited States$cz$bVirginia$cz$bCharlottesville$2aat
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1 - Primary Entry is a primary subject. A subject expression or string is considered
primary if it covers the main focus or subject content associated with the
community information entity.
Heading: meetings
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654 |
1#$cac$ameetings$2aat
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2 - Secondary Entry is a secondary subject. A subject expression or string is considered
secondary if it represents a less important aspect associated with the
community information entity.
Heading: housing-United States-Illinois-McHenry County
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654 |
2#$cob$ahousing$cz$bUnited States$cz$bIllinois$cz$bMcHenry County$2aat
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Second Indicator - Undefined Undefined and contains a blank (#).
■ SUBFIELD CODES
$a - Focus term Term is considered the focus term. A focus term is the concrete thing, being,
idea, or activity forming the basis of the indexing entry. The subfield is
repeated when there is more than one expression in the field.
Heading: French Colonial landscapes-United States-New Jersey
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654 |
##$csp$bFrench Colonial$cob$alandscapes$cz$bUnited States$cz$bNew Jersey$2aat [The focus term in the AAT expression is "landscapes."] |
$b - Non-focus term Term other than that considered the focus.
Heading: garden club-meetings
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654 |
##$cpo$bgarden club$ameetings$2aat [The focus term in the AAT expression is "meetings."] |
$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. Subfield $c always precedes the data
to which it is associated.
The designations differ, depending on the subject heading thesaurus used (as
specified by the code found in subfield $2). The designations and their
associated facets/hierarchies can be found in the thesaurus identified by subfield
$2.
Heading: housing-United States-Florida-Miami
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654 |
##$cob$ahousing$cz$bUnited States$cz$bFlorida$cz$bMiami$2aat
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$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 $y is
appropriate only when a chronological subject subdivision is added to a main
term.
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654 |
0#$cr$alandscape$y18th century$zEngland.$2aat
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$z - Geographic subdivision Geographic subject subdivision. Subfield $z is appropriate in field 650
only when a geographic subject subdivision is added to a main term.
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654 |
0#$cr$alandscape$y18th century$zEngland.$2aat
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$0 - Authority record control number
$2 - Source of heading or term
Heading: country houses-United States-Kentucky
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654 |
##$cob$acountry houses$cz$bUnited States$cz$bKentucky$2aat
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$3 - Materials specified Part of the collection, etc. to which the field applies.
Heading: business letters: housing-United States
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654 |
##$3business letters$cr$ahousing$cz$bUnited States.$2aat
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$8 - Field link and sequence number
INPUT CONVENTIONS
Punctuation - The subfield preceding subfield $2 in field 654 ends with a mark of
punctuation or a closing parenthesis.
Display Constant - The dash (-) that precedes any non-focus term that follows a focus term, that
precedes a second, etc. focus term, or that precedes a subdivision 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
$0 - Authority record control number [NEW, 2007]