| First Indicator | Second Indicator |
|---|---|
| Undefined # - Undefined |
147/447/547 - Undefined # - Undefined 747 - 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 | |
|---|---|
|
Main term portion
Tracing and linking subfields
|
Subject subdivision portion
|
Content designators identify the subelements occurring in named event headings constructed according to generally accepted thesaurus-building conventions (e.g., Faceted Application of Subject Terminology (FAST)). Named events are those which cannot be regarded as responsible agents, e.g., battles, earthquakes, famines, financial crises, fires, hurricanes, riots, strikes, volcanic eruptions, wars, etc.
Named events which can be regarded as responsible agents such as meetings or conferences as well as athletic contests, competitions, expeditions, expositions, fairs, festivals, sports events, tournaments, etc., are recorded in X11 fields.
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 fields 447 and 547) and the 7XX Heading Linking Entries-General Information section (for field 747).
First Indicator - Undefined
Undefined and contains a blank (#).
Second Indicator
In fields 147, 447, and 547, the second indicator position is undefined and contains a blank (#). For field 747, the second indicator position contains one of the values described in the 7XX Heading Linking Entries-General Information section.
$a - Named event
Name of an event which cannot be regarded as a responsible agent.
| 147 | ##$aEruption of Vesuvius$c(Italy :$d79) | ||||||||
$c - Location of named event
Place name or a name of an institution where a named event occurred. Multiple adjacent locations are contained in a repeatable subfield $c.
| 447 | ##$aBreed's Hill, Battle of$c(Boston, Massachusetts :$d1775) | ||||||||
$d - Date of named event
Date or time period related to a named event.
| 547 | ##$aAmerican Civil War$d(1861-1865) | ||||||||
$g - Miscellaneous information
Data element that is not more appropriately contained in another defined subfield.
$i - Relationship information [447/547/747]
Designation of a relationship of the entity in a 447, 547, or 747 field to the 1XX entity in the record or a textual reference instruction phrase. For fields 447 and 547 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 447, 547, and 747. Guidelines for using subfield $i in fields 447 and 547 are provided in the Tracings and References-General Information section. Guidelines for using subfield $i in field 747 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 the X47 fields only when a form subject subdivision is added to a main term to form an extended heading.
$w - Control subfield [447/547/747]
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 fields 447, 547, and 747. Character position definitions and guidelines for applying the codes defined for subfield $w in fields 447 and 547 are provided in the Tracings and References-General Information section. Character position definitions and guidelines for field 747 are provided in the 7XX Heading Linking Entries-General Information section.
$x - General subdivision
Subject subdivision that is not more appropriately contained in subfield $v (Form subdivision), subfield $y (Chronological subdivision), and subfield $z (Geographic subdivision). Subfield $x is appropriate in the X47 fields only when a general topical subject subdivision is added to a main term to form an extended heading.
$y - Chronological subdivision
Subject subdivision that represents a period of time. Subfield $y is appropriate in the X47 fields only when a chronological subject subdivision is added to the main term to form an extended heading.
$z - Geographic subdivision
Appropriate in the X47 fields only when a geographic subject subdivision is added to a main term to form an extended heading.
$0 - Authority record control number or standard number [547/747]
See description of this subfield in Appendix A: Control Subfields.
$1 - Real World Object URI [547/747]
See description of this subfield in Appendix A: Control Subfields.
$2 - Source of heading or term [747]
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 747. Guidelines for applying subfield $2 are provided in the 7XX Heading Linking Entries-General Information section.
$4 - Relationship [447/547/747]
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 447 and 547 are provided in the Tracings and References-General Information section. Guidelines for using subfield $4 in field 747 are provided in the 7XX Heading Linking Entries-General Information section.
$5 - Institution to which field applies [447/547/747]
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 X47 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, acronyms, or abbreviations. One space is used between preceding and succeeding initials if an abbreviation consists of more than a single letter.
Display Constant
| - | [dash associated with the content of subfield $v, $x, $y, and $z] |
Dash (-) that precedes a subject subdivision in an extended subject 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.
Subfield $4 was renamed and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.