MARC 21 Format for Classification Data: 753: Index Term-Uncontrolled (Network Development and MARC Standards Office, Library of Congress)

Uncontrolled index terms to supplement terms derived from data in the MARC classification record that are not derived from a controlled subject heading system/thesaurus that provide subject access to a classification number or span in field 153 (Classification number) or an index term in field 154 (General Explanatory Index Term).

May be used to provide additional terms not appearing in the classification data record, such as synonyms or permutations of phrases, to provide references between related terms, and to provide vocabulary control using see references. Such index terms are not controlled by a thesaurus or other authority file, such as LCSH or MeSH. Index terms that are controlled are recorded in fields 700, 710, 711, 730, 750, or 751.

An uncontrolled index term in field 753 is contained in the record for the classification number or general index term to which it refers. If the index term is associated with a classification number the record contains field 153 (Classification Number). If an index term has no classification number associated with it or with any of its subtopics and thus cannot be contained in a record with a classification number in field 153, an index term record may be created (008/06 (Kind of record), code c) containing the index term in field 154 (General Explanatory Index Term), with the associated text in field 753.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

Second Indicator - Type of term or name

Distinguishes uncontrolled index terms by type.

# - No information provided

0 - Topical term

1 - Personal name

2 - Corporate name

3 - Meeting name

4 - Chronological term

5 - Geographic name

6 - Genre/form term

■ SUBFIELD CODES

$a - Index term

Terms comprising the entry in an index to a classification schedule. If the entry consists of several terms at several levels, additional levels are contained in subfield $b (Index term--succeeding level)

Term in subfield $a is used for a classification number citation in the published index. If the index term is an unused term that is followed by the used term in subfield $u or a term under which a see also reference appears, it is contained in subfield $d (Index term referred from).


084	0#$alcc [Library of Congress Classification]
153	##$aPS648.W58$hAmerican Literature$hCollections of American literature$hProse (General)$hSpecial forms and topics, A-Z$jWolf children
753	##$aWolf children in literature$bAmerican$bCollections$bProse


Display example:
Wolf children in literature
	American
		Collections
		Prose: PS648.W58

$b - Index term-succeeding level

Term at a level after the first in an index term. May also be used for the succeeding level of an index term referred from, which is contained in subfield $d.


084	0#$addc$c21 [Dewey Decimal Classification]
153	##$a338.47$hSocial sciences$hEconomics$hProduction$kSpecific kinds of industries$hSecondary industries and services$jGoods and services
680	1#$iClass here quantities produced, shortages, surpluses, stockpiles, forecasts, and projections of supply and demand
753	##$aDemand$bforecasts$bsecondary industries


Display example:
Demand
	forecasts
		secondary industries: 338.47

$d - Index term referred from

Index term that refers to another index term, either as a see or see also reference. When subfield $d is used, the field also contains either subfield $s (See also reference term) or subfield $u (Use reference term).


084	0#$addc$c21 [Dewey Decimal Classification]
153	##$a362.2$hSocial sciences$hSocial problems and services; associations$kSocial problems and services$kSpecific social problems and services$hSocial welfare problems and services$kProblems of and services to persons with illnesses and disabilities$jMental and emotional illnesses and disturbances
753	##$aMental illness
753	##$dCompulsive lying$sMental illness


Display example:
Compulsive lying
	see also Mental illness
Mental illness: 362.2

$e - Example class number

Classification number or span that functions as an example related to data in other subfields in field 753.


084	0#$anlm$c5th ed., rev. [National Library of Medicine Classification]
154	##$aFollow-up studies
753	##$iForm number 20 in any NLM schedule where applicable
753	##$iIn a particular area, with the subject of the original study, e.g. Heart Diseases,$eWG 210

$i - Explanatory text

Explanatory text associated with the index term.


084	0#$anlm$c5th ed., rev. [National Library of Medicine Classification]
154	##$aFollow-up studies
753	##$iForm number 20 in any NLM schedule where applicable
753	##$iIn a particular area, with the subject of the original study, e.g. Heart Diseases,$eWG 210 [The record is an index only term record, identified by code c in 008/06 (Kind of record).]

Display example:

Follow-up studies

(Form number 20 in any NLM schedule where applicable)

In a particular area, with the subject of the original

study, e.g., Heart Diseases WG210

$s - See also reference term

Term to which a see also reference is made from the term in subfield $d (Index term referred from).


084	0#$addc$c21 [Dewey Decimal Classification]
153	##$a362.0425$hSocial sciences$hSocial problems and services; associations$kSocial problems and services$kSpecific social problems and services$hSocial welfare problems and services$hSpecial topics$hSocial problems$jSocial action
753	##$aEmployment services$bsocial services
753	##$aSheltered employment
753	##$dSheltered employment$sEmployment services$tsocial services


Display example:
Employment services
	social services: 362.0425
Sheltered employment: 362.0425
	see also Employment services - social services

$t - See also reference term-succeeding level

Term at a level after the first in a see also reference term.


084	0#$addc$c21 [Dewey Decimal Classification]
153	##$a363.1929$hSocial sciences$hSocial problems and services; associations$kSocial problems and services$kSpecific social problems and services$hOther social problems and services$hPublic safety programs$hProduct hazards$hFoods$jSpecific foods
680	0#$aIncluding beverages, canned goods, dairy products, meats
753	##$aDairy products$bproduct safety
753	##$dDairy products$bproduct safety$sFood$tproduct safety


Display example:
Dairy products
	product safety: 363.1929
		see also Food - product safety

$u - Use reference term

Term under which a classification number citation will appear when the term in subfield $d (Index term referred from) or field 154 (General Explanatory Index Term) contains an unused term.

$v - Use reference term-succeeding level

Term at a level after the first under which a classification number citation will appear when the term in subfield $d (Index term referred from) or field 154 (General Explanatory Index Term) contains an unused term.


753	##$dState labor$bWages$uWages$vState labor


Display example:
State labor: [Classification Number]
	Wages, see Wages - State labor

■ EXAMPLES


084	0#$addc$c21 [Dewey Decimal Classification]
153	##$a786.7$hThe arts. Fine and decorative arts$hMusic$kPrinciples, forms, ensembles, voices, instruments$kEnsembles, voices, instruments$kInstruments and their music$kSpecific instruments and their music$hKeyboard, mechanical, electrophonic, percussion instruments$jElectrophones. Electronic instruments
753	##$aElectronic musical instruments
753	##$dElectronic musical instruments$sElectrophones
753	##$aElectrophones
753	##$dComputers$bmusic$sElectrophones [The last index term, which is a see also reference, acts like a tracing, since it is located in the record representing the term to which it refers, i.e. the record for Electrophones, not the record for Computers--music.]


Display example:
Computers
	music
		see also Electrophones
Electronic musical instruments: 786.7
		see also Electrophones
Electrophones: 786.7

INPUT CONVENTIONS

Use of terms - In addition to terms in a classification index, this field may include any term which might be useful to the classifier, e.g. equivalent topics in other languages, commonly used terms, etc.

Display constants - Display constants may be system generated and associated with a subfield code. The following subfield codes may be associated with display constants:

Subfield	Display constant
$b	-
$s	see also
$t	-
$u	see
$v	-

753 - Index Term-Uncontrolled (R)

FIELD DEFINITION AND SCOPE

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

■ EXAMPLES

INPUT CONVENTIONS

CONTENT DESIGNATOR HISTORY


Subfield Codes
$a - Index term (R) $b - Index term-succeeding level (R) $d - Index term referred from (R) $e - Example class number (R) $i - Explanatory text (R) $s - See also reference term (NR)	$t - See also reference term-succeeding level (R) $u - Use reference term (NR) $v - Use reference term-succeeding level (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)