X81 Geographic Subdivisions - General Information (Variable Data Field)
Each geographic subdivision field is unique in its definition and scope. For specific information, select from the list below.
181 Heading - Geographic Subdivision (NR)
481 See From Tracing - Geographic Subdivision (R)
581 See Also From Tracing - Geographic Subdivision (R)
781 Subdivision Linking Entry - Geographic Subdivision (R)
Record requirements: The National level record requirement
for the geographic subdivision fields is Mandatory if applicable, except for field 781 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 geographic subdivision headings constructed according to generally accepted thesaurus-building conventions (e.g., Library of Congress Subject Headings, Medical Subject Headings).
A geographic subdivision is used as a subdivision portion of an extended
subject or index term access field in bibliographic records.
A geographic name that is used as the lead element of an established heading
record is contained in a 151 (Heading - Geographic Name)
field.
The indicators, subfield codes, and input conventions for the geographic subdivision fields 181, 481, 581, and 781 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 X81 | Geographic Subdivisions | * | * |
Indicator: | |||
First | Undefined; contains a blank | M | |
Second | |||
181, 481, 581 | Undefined; contains a blank | M | |
781 | 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 | A | R | |
$z | M | R | |
Tracing and linking subfields | |||
$i | Reference instruction phrase [481, 581] | A | NR |
$w | Control subfield [481, 581, 781] | A | NR |
$0 | Record control number [581, 781] | A | R |
$2 | A | NR | |
$5 | Institution to which field applies [481, 581, 781] | A | R |
$6 | A | NR | |
$8 | O | R |
Display constant for X81 fields
Subfields $v - Record control number [781] [obsolete] [USMARC only]
$0 - Record control number [581, 781] [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:
