| First Indicator | Second Indicator |
|---|---|
| Undefined # - Undefined |
185/485/585 - Undefined # - Undefined 785 - 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
|
Tracing and linking subfields
|
Content designators identify the subelements occurring in form subdivision headings constructed according to generally accepted thesaurus-building conventions (e.g., Medical Subject Headings). A form subdivision is used as a subdivision portion of an extended subject or index term access field in bibliographic records. A form term that is used as the lead element of an established heading record is contained in a 155 (Heading-Genre/Form 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 485 and 585) and the 7XX Heading Linking Entries-General Information section (for field 785).
First Indicator - Undefined
Undefined and contains a blank (#).
Second Indicator
In fields 185, 485, and 585, the second indicator position is undefined and contains a blank (#). For field 785, the second indicator position contains one of the values described in the 7XX Heading Linking Entries-General Information section.
$i - Relationship information [485/585/785]
Designation of a relationship of the entity in a 485, 585, or 785 field to the 1XX entity in the record or a textual reference instruction phrase. For fields 485 and 585 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 485, 585, and 785. Guidelines for using subfield $i in fields 485 and 585 are provided in the Tracings and References-General Information section. Guidelines for using subfield $i in field 785 are provided in the 7XX Heading Linking Entries-General Information section.
$v - Form subdivision
Designates a specific kind or genre of material as defined by the thesaurus being used.
| 185 | ##$vFiction | ||||||||
| 185 | ##$vAbbreviations | ||||||||
| 185 | ##$vIndexes$vPeriodicals | ||||||||
| 040 | ##$aDNLM$cDNLM | ||||||||
| 185 | ##$vcase studies$vsoftware | ||||||||
$w - Control subfield [485/585/785]
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 485, 585, and 785. Character position definitions and guidelines for applying the codes defined for subfield $w in field 485 and 585 are provided in the Tracings and References-General Information section. Character position definitions and guidelines for field 785 are in the 7XX Heading Linking Entries-General Information section.
$x - General subdivision
Topical or language subdivision term. Subfield $x is appropriate in an X85 field only when a general subdivision is added to a form subdivision to form an extended subdivision heading.
| 185 | ##$vDictionaries$xSpanish | ||||||||
$y - Chronological subdivision
Subdivision term that represents a period of time. Subfield $y is appropriate in an X83 field only when a chronological subdivision is added to a form subdivision to form an extended subdivision heading.
| 185 | ##$vPoetry$yTo 1500 | ||||||||
$z - Geographic subdivision
Appropriate in an X85 field only when a geographic subdivision is added to a form subdivision to form an extended subdivision heading.
| 185 | ##$vCatalogs and collections$zUnited States | ||||||||
$0 - Authority record control number or standard number [585/785]
See description of this subfield in Appendix A: Control Subfields.
$1 - Real World Object URI [585/785]
See description of this subfield in Appendix A: Control Subfields.
$2 - Source of heading or term [785]
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 785. Guidelines for applying subfield $2 are provided in the 7XX Heading Linking Entries-General Information section.
$4 - Relationship [485/585/785]
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 485 and 585 are provided in the Tracings and References-General Information section. Guidelines for using subfield $4 in field 785 are provided in the 7XX Heading Linking Entries-General Information section.
$5 - Institution to which field applies [485/585/785]
See description of this subfield in Appendix A: Control Subfields.
$6 - Linkage
See description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See description of this subfield in Appendix A: Control Subfields.
Punctuation - Punctuation of the subelements of a heading is generally dictated by subject heading system/thesaurus rules. These input conventions clarify MARC punctuation practices. An X85 field does not end with a mark of punctuation unless the field ends with an abbreviation, an initialism, or data that ends with a mark of punctuation.
Spacing - No spaces are used in initialisms.
| 185 | ##$vPeriodicals$zNew York (N.Y.) | ||||||||
One space is used between the final period of an abbreviated term and a word or numeral that follows.
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.
Use of subfields $v, $x, $y, and $z in LCSH - For terms from Library of Congress Subject Headings, subfield $v (Form subdivision), subfield $x (General subdivision), subfield $y (Chronological subdivision), and subfield $z (Geographic subdivision) are unlikely to be used in conjunction with a primary term in an X85 field, since a form subdivision would generally not be followed by another subdivision when it is functioning as a form.
Subfield $4 was renamed and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.