| First Indicator | Second Indicator |
|---|---|
| Undefined # - Undefined |
181/481/581 - Undefined # - Undefined 781 - 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
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Tracing and linking subfields
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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.
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 481 and 581) and the 7XX Heading Linking Entries-General Information section (for field 781).
First Indicator - Undefined
Undefined and contains a blank (#).
Second Indicator
In fields 181, 481, and 581, the second indicator position is undefined and contains a blank (#). For field 781, the second indicator position contains one of the values described in the 7XX Heading Linking Entries-General Information section.
$i - Relationship information [481/581/781]
Designation of a relationship of the entity in a 481, 581, or 781 field to the 1XX entity in the record or a textual reference instruction phrase. For fields 481 and 581 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 481, 581, and 781. Guidelines for using subfield $i in fields 481 and 581 are provided in the Tracings and References-General Information section. Guidelines for using subfield $i in field 781 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 $v is appropriate in an X81 field only when a form subject subdivision is added to a geographic subdivision to form an extended subdivision heading.
| 181 | ##$zParis (France)$vPhotographs | ||||||||
$w - Control subfield [481/581/781]
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 481, 581, and 781. Character position definitions and guidelines for applying the codes defined for subfield $w in field 481 and 581 are provided in the Tracings and References-General Information section. Character position definitions and guidelines for field 781 are in the 7XX Heading Linking Entries-General Information section.
$x - General subdivision
Topical or language subdivision term. Subfield $x is appropriate in an X81 field only when a general subdivision is added to a geographic subdivision to form an extended subdivision heading.
| 181 | ##$zMississippi$zTippah County$xHistory | ||||||||
$y - Chronological subdivision
Subdivision term that represents a period of time. Subfield $y is appropriate in an X81 field only when a chronological subdivision is added to a geographic subdivision to form an extended subdivision heading.
| 181 | ##$zWashington (D.C.)$y1890-1910 | ||||||||
| 181 | ##$zFrance$y18th century | ||||||||
$z - Geographic subdivision
| 181 | ##$zHudson River Valley (N.Y. and N.J.) | ||||||||
| 181 | ##$zUnited States | ||||||||
| 181 | ##$zNew York (State)$zBuffalo | ||||||||
| 181 | ##$zItaly, Southern | ||||||||
$0 - Authority record control number or standard number [581/781]
See description of this subfield in Appendix A: Control Subfields.
$1 - Real World Object URI [581/781]
See description of this subfield in Appendix A: Control Subfields.
$2 - Source of heading or term [781]
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 781. Guidelines for applying subfield $2 are provided in the 7XX Heading Linking Entries-General Information section.
$4 - Relationship [481/581/781]
Code or URI that specifies the relationship from the entity described in the record to the entity referenced in the field. Guidelines for using subfield $4 in fields 481 and 581 are provided in the Tracings and References-General Information section. Guidelines for using subfield $4 in field 781 are provided in the 7XX Heading Linking Entries-General Information section.
$5 - Institution to which field applies [481/581/781]
See description of this subfield in Appendix A: Control Subfields.
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.
Punctuation - Punctuation of the subelements of a heading is generally dictated by subject heading system/thesaurus rules. These input conventions clarify MARC punctuation practices. An X81 field does not end with a mark of punctuation unless the field ends with an abbreviation or data that ends with a mark of punctuation.
| 181 | ##$zMexico$xSocieties, etc. | ||||||||
Spacing - No spaces are used in initialisms.
| 181 | ##$zWashington (D.C.) | ||||||||
| 181 | ##$zHudson River Valley (N.Y. and N.J.) | ||||||||
Display Constant
| - | [dash associated with the content of subfield $v, $x, $y, and $z] |
Dash (-) that precedes a subdivision in an extended 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 $z.
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Content designated field:
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| 181 | ##$zWashington (D.C.)$y1890-1910 | ||||||||
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Display example: Washington (D.C.)-1890-1910
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Subfield $4 was renamed and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.