Library of Congress >> MARC >> Authority >> Names and Terms  >> X82

X82 - Chronological Subdivisions-General Information


MARC 21 Authority
October 2014

"Full" documentation refers to the MARC 21 Format for Authority Data that contains detailed descriptions of every data element, along with examples, input conventions and history sections.

"Concise" documentation refers to the MARC 21 Format for Authority Data that contains abridged descriptions of every data element, along with examples.


First Indicator Second Indicator
Undefined
# - Undefined

182/482/582 - Undefined
# - Undefined

782 - 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



Subfield Codes

Subject subdivision portion

  • $v - Form subdivision (R)
  • $x - General subdivision (R)
  • $y - Chronological subdivision (R)
  • $z - Geographic subdivision (R)

Tracing and linking subfields

  • $i - Relationship information (R)   [482/582/782]
  • $w - Control subfield (NR)   [482/582/782]
  • $0 - Authority record control number or standard number (R)   [582/782]
  • $2 - Source of heading or term (NR)   [782]
  • $4 - Relationship code (R)   [482/582/782]
  • $5 - Institution to which field applies (R)   [482/582/782]
  • $6 - Linkage (NR)
  • $8 - Field link and sequence number (R)

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

Content designators identify the subelements occurring in chronological subdivision headings constructed according to generally accepted thesaurus-building conventions (e.g., Library of Congress Subject Headings, Medical Subject Headings). A chronological subdivision is used as a subdivision portion of an extended subject or index term access field in bibliographic records. A chronological term that is used as the lead element of an established heading record is contained in a 150 (Heading-Topical Term) field.

Only generally-applicable content designators are described in full in this section. A small number of content designators with field-specific instructions are described in the Tracings and References-General Information section (for field 482 and 582) and the 7XX Heading Linking Entries-General Information section (for field 782).

INDICATORS

First Indicator - Undefined

Undefined and contains a blank (#).

Second Indicator

In fields 182, 482, and 582, the second indicator position is undefined and contains a blank (#). For field 782, the second indicator position contains one of the values described in the 7XX Heading Linking Entries-General Information section.

SUBFIELD CODES

$i - Relationship information   [482/582/782]

Designation of a relationship of the entity in a 482, 582, or 782 field to the 1XX entity in the record or a textual reference instruction phrase. For fields 482 and 582 the phrase may be system-generated from the field tag or from the codes defined for subfield $w (Control subfield). Subfield $i is appropriate only in fields 482, 582, and 782. Guidelines for using subfield $i in fields 482 and 582 are provided in the Tracings and References-General Information section. Guidelines for using subfield $i in field 782 are provided in the 7XX Heading Linking Entries-General Information section.

$v - Form subdivision

Designates a specific kind or genre of material as defined by the thesaurus being used. Subfield $v is appropriate in an X82 field only when a form subject subdivision is added to a chronological subdivision to form an extended subdivision heading.

182 ##$y1981-$vPeriodicals

$w - Control subfield   [482/582/782]

Codes in one or more character positions defined to control the display of information and specify relationships, restrictions, and status. Subfield $w is appropriate only in field 482, 582, and 782. Character position definitions and guidelines for applying the codes defined for subfield $w in field 482 and 582 are provided in the Tracings and References-General Information section. Character position definitions and guidelines for field 782 are in the 7XX Heading Linking Entries-General Information section.

$x - General subdivision

Topical or language subdivision term. Subfield $x is appropriate in an X82 field only when a general subdivision is added to a chronological subdivision to form an extended subdivision heading.

182 ##$y1981-$xFrench
182 ##$yEarly modern, 1500-1700$xHistory and criticism

$y - Chronological subdivision

Subdivision term that represents a period of time.

182 ##$yTo 1500
182 ##$y18th century
182 ##$yEarly church, ca. 30-600
182 ##$yGreat War, 1843-1852

$z - Geographic subdivision

Appropriate in an X82 field only when a geographic subdivision is added to a chronological subdivision to form an extended subdivision heading.

$0 - Authority record control number or standard number   [582/782]

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

$2 - Source of heading or term   [782]

Code that identifies the source of a heading or term when the second indicator position contains value 7. Subfield $2 is appropriate only in field 782. Guidelines for applying subfield $2 are provided in the 7XX Heading Linking Entries-General Information section.

$4 - Relationship code   [482/582/782]

Contains in coded form the designation of a relationship of the entity in a 482, 582, or 782 field to the 1XX entity in the record. Guidelines for using subfield $4 in fields 482 and 582 are provided in the Tracings and References-General Information section. Guidelines for using subfield $4 in field 782 are provided in the 7XX Heading Linking Entries-General Information section.

$5 - Institution to which field applies   [482/582/782]

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

$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 - Punctuation of the subelements of a heading is generally dictated by subject heading system/thesaurus rules. These input conventions clarify MARC punctuation practices. An X82 field does not end with a mark of punctuation unless the field ends with an abbreviation, an initialism, or data that ends with a mark of punctuation.

182 ##$yTo 221 B.C.
182 ##$y1981-

Spacing - No spaces are used in initialisms.

182 ##$y332-30 B.C.

One space is used between the final period of an abbreviated term and a word or numeral that follows.

182 ##$yEarly church, ca. 30-600

Display Constant

- [dash associated with the content of subfield $v, $x, $y, and $z]

Dash (-) that precedes a subject subdivision heading is not carried in the MARC record. It may be system generated as a display constant associated with the content of subfield $v, $x, $y, and $z.

 
Content designated field:
182 ##$y18th century
Display example:
18th century

CONTENT DESIGNATOR HISTORY

$i - Reference instruction phrase [482/582] [REDEFINED, 2009]
$i - Relationship information [782] [NEW, 2014]
$0 - Record control number [582/782] [REDEFINED, 2010]
$4 - Relationship code [482/582] [NEW, 2009]
$4 - Relationship code [782] [NEW, 2014]

Library of Congress >> MARC >> Authority >> Names and Terms  >> X82
(10/20/2014)
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