650 - Subject Added Entry-Topical Term (R)
MARC 21 Community Information - Full
October 2007
First Indicator Level of subject # - No information available 0 - No level specified 1 - Primary 2 - Secondary
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Second Indicator Thesaurus 0 - Library of Congress Subject Headings 1 - LC subject headings for children's literature 2 - Medical Subject Headings 3 - National Agricultural Library subject authority file 4 - Source not specified 5 - Canadian Subject Headings 6 - Répertoire de vedettes-matière 7 - Source specified in subfield $2
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Subfield Codes
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Main term portion $a - Topical term or geographic name as entry element (NR) $b - Topical term following geographic name as entry element (NR)
Subject subdivision portion $v - Form subdivision (R) $x - General subdivision (R) $y - Chronological subdivision (R) $z - Geographic subdivision (R) |
Control subfields
$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)
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FIELD DEFINITION AND SCOPE
Topical subject used as a subject added entry.
Subject added entries are assigned to a community information record to provide access
according to generally accepted thesaurus-building rules (e.g., Library of Congress
Subject Headings (LCSH), Medical Subject Headings (MeSH)). Field 650
may be used by any institution assigning subject headings based on the lists and
authority files identified in the second indicator position or in subfield $2
(Source of heading or term).
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
■ INDICATORS
First Indicator - Level of subject Level of the subject entry. This indicator is used to distinguish primary and
secondary descriptors.
# - No information available
0 - No level specified Level of the subject term could be determined but is not specified.
1 - Primary Entry is a primary subject.A subject is considered primary if it covers the main focus or subject content
associated with the community information entity.
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650 |
17$aCareer Exploration.$2ericd
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650 |
17$aCooks.$2ericd
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2 - Secondary Entry is a secondary subject.A subject is considered secondary if it represents a less important aspect
associated with the community information entity.
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650 |
17$aFood Service.$2ericd
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650 |
27$aJunior High Schools.$2ericd [Primary and secondary subject content identified.] |
Second Indicator - Thesaurus Name and/or subject heading system or thesaurus used in constructing the subject
heading.
0 - Library of Congress Subject Headings Subject added entry conforms to and is appropriate for use in the
Library
of Congress Subject Headings (LCSH) that is maintained by the Library
of Congress.Conforms to
LCSH is defined as:
- topical headings (or topical headings and subdivisions) found in the LC
subject authority file or in the latest edition of LCSH, including
the latest microfiche, printed version, CD-ROM, and supplements;
- topical headings found in the LC subject authority file or in the latest
edition of LCSH to which is added a free-floating or regular
subdivision according to the rules stated in the Subject Cataloging
Manual: Subject Headings, particularly subdivisions listed in the
pattern lists, and geographic subdivisions formulated and applied according
to the rules in the manual;
- topical headings not printed in LCSH in the past but which have
been used by LC and which are not likely to have changed (e.g., names of
chemical compounds);
- certain music headings with qualifiers specifying instruments or vocal
parts when the main heading has a general scope note printed in
LCSH, with or without a general see also reference.
1 - LC subject headings for children's literature Subject added entry conforms to the "AC Subject Headings" section of
Library of Congress Subject Headings and is appropriate for use in
the LC Annotated Card Program.LCSH is maintained by the Library of Congress.
2 - Medical Subject Headings Subject added entry conforms to and is appropriate for use in Medical
Subject Headings (MeSH) and/or the NLM name authority filesMeSH is maintained by the National Library of Medicine.
3 - National Agricultural Library subject authority file Subject added entry conforms to the U.S. National Agricultural Library subject
authority file.Requires that the field is appropriate for NAL subject heading purposes.
4 - Source not specified Subject added entry conforms to a controlled list but the source cannot be
specified by one of the subject heading system/thesauri covered by second
indicator values 0-3, 5-6 or by a code for a specific subject heading list in
subfield $2.Field 653 (Index Term-Uncontrolled) is used to record terms that are not
derived from controlled subject heading lists.
5 - Canadian Subject Headings Subject added entry conforms to and is appropriate for use in Canadian
Subject Headings that is maintained by the Library and Archives
Canada.
6 - Répertoire de vedettes-matière Subject added entry conforms to the Répertoire de vedettes-matière
that is maintained by the Bibliothèque de l'Université Laval.
7 - Source specified in subfield $2
■ SUBFIELD CODES
$a - Topical term or geographic name as entry element Topical subject or a geographic name used as an entry element for a topical term.
Parenthetical qualifying information associated with the term is not separately
subfield coded.
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650 |
#0$aMeals on wheels programs.
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650 |
#0$aNursing home care.
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650 |
#0$aNutrition disorders.
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650 |
#0$aConcertos (String orchestra)
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650 |
#0$aVocal music$zFrance$y18th century.
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650 |
#0$aDentistry$xResearch.
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$b - Topical term following geographic name as entry element Topical term that is entered under a geographic name contained in subfield
$a.
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650 |
#0$aCaracas.$bBolivar Statue.
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$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 main term.
$x - General subdivision Subject subdivision that is not more appropriately contained in subfields
$v (Form subdivision, $y (Chronological subdivision) or
$z (Geographic subdivision). Subfield $x is appropriate only
when a general topical or form subject subdivision is added to a main term.
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650 |
#0$anumismatics$xCollectors and collecting.
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$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.
$z - Geographic subdivision Geographic subject subdivision. Subfield $z is appropriate only when a
geographic subject subdivision is added to a main term.
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650 |
#0$aHousing rehabilitation$zGeorgia.
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650 |
#0$aReal property$zMississippi$zTippah County.
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$0 - Authority record control number
$2 - Source of heading or term
Used only when the second indicator position contains value 7 (Source specified in
subfield $2).
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650 |
#7$aFood Service.$2ericd
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$3 - Materials specified Part of the described materials to which the field applies.
$8 - Field link and sequence number
INPUT CONVENTIONS
Ambiguous Headings - See Appendix D.
Punctuation - Field 650 ends with a mark of punctuation or a closing parenthesis. If the final
subfield is subfield $2, the mark of punctuation or closing parenthesis
precedes the subfield.
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650 |
#0$aBallads, American$zHudson River Valley (N.Y. and N.J.)
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650 |
17$aCareer Exploration.$2ericd
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A topical term followed by a subject subdivision does not end with a mark of punctuation
unless the topical term ends with an abbreviation, initial/letter, or open date.
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650 |
#0$aMental health counseling$zWashington (State)$zSeattle.
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Spacing - No spaces are used in initialisms, acronyms, or abbreviations. One space is used between
preceding and succeeding initials if an abbreviation consists of more than a single
phrase.
Display Constant - The dash ( - ) that precedes a subject subdivision in an extended subject heading is not
carried in the machine-readable record. It may be system generated as a display constant
associated with the content of subfields $x, $y, and
$z.
Initial Articles - Initial articles (e.g., The) occurring at the beginning of topical subject added entry
fields are usually omitted in most languages (except when the intent is to file on the
article). Any diacritics and/or special characters occurring at the beginning of fields
are retained. Note that such characters are usually ignored for purposes of sorting and
filing.
CONTENT DESIGNATOR HISTORY
$0 - Authority record control number [NEW, 2007]