X82 Chronological Subdivisions - General Information (Variable Data Field)
Each chronological subdivision field is unique in its definition and scope. For specific information, select from the list below.
182 Heading - Chronological Subdivision (NR)
482 See From Tracing - Chronological Subdivision (R)
582 See Also From Tracing - Chronological Subdivision (R)
782 Subdivision Linking Entry - Chronological Subdivision (R)
Record requirements: The National level record requirement
for the chronological subdivision fields is Mandatory if applicable, except for field 782 which is Optional. For the national level requirements by subfield, see the specific field.
Field repeatability: See the specific field for its repeatability
.
Guidelines for applying content designators:
The 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.
The indicators, subfield codes, and input conventions for the chronological subdivision fields 182, 482, 582, and 782 follow similar patterns. Guidelines for applying them are below. Subfields are grouped by type of entry.
For indicator and subfield code definitions and examples, National level (NLR) record requirements , and designator repeatability , see table below. An asterisk ( * ) in the column indicates that the requirement varies. See table in the specific field.:
Position | Description | NLR | Repeatability |
Field X82 | Chronological Subdivisions | * | * |
Indicator: | |||
First | Undefined; contains a blank | M | |
Second | |||
182, 482, 582 | Undefined; contains a blank | M | |
782 | M | ||
0 | A | ||
1 | A | ||
2 | A | ||
3 | A | ||
4 | A | ||
5 | A | ||
6 | A | ||
7 | A | ||
Subfield code: | |||
Subject subdivision portion | |||
$v | A | R | |
$x | A | R | |
$y | M | R | |
$z | A | R | |
Tracing and linking subfields | |||
$i | Reference instruction phrase [482, 582] | A | NR |
$w | Control subfield [482, 582, 782] | A | NR |
$0 | Record control number [582, 782] | A | R |
$2 | A | NR | |
$5 | Institution to which field applies [482, 582, 782] | A | R |
$6 | A | NR | |
$8 | O | R |
Display constant for X82 fields
Subfields $v - Record control number [782] [obsolete] [USMARC only]
$0 - Record control number [582, 782] [new]
$3 - Authority record control number [obsolete, 1997] [CAN/MARC only]
In USMARC, from 1993 to 1995, subfield $v was defined as Record control number in the 7XX Heading Linking Entry fields. When subfield $v was adapted for form subdivisions in MARC bibliographic and authority heading fields in 1995, subfield $v was redefined as Form subdivision. In 1997, subfield $0 was added as Record control number in 5XX and 7XX fields.
Related MARC fields or documents:
7XX Heading Linking Entries - General Information
880 Alternate Graphic Representation
Tracing and Reference Fields - General Information
MARC Code List for Organizations
Symbols and Interlibrary Loan Policies in Canada
See also:
