X48 - Chronological Terms-General Information
MARC 21 Authority
October 2002
"Full" documentation refers to the MARC 21 Format for Authority Data that contains detailed descriptions of every data element, along with examples, input conventions and history sections.
"Concise" documentation refers to the MARC 21 Concise Format for Authority Data that contains abridged descriptions of every data element, along with examples.
448 - See From Tracing - Chronological Term (R)
Full |
Concise
548 - See Also From Tracing - Chronological Term (R)
Full |
Concise
748 - Established Heading Linking Entry - Chronological Term (R)
Full |
Concise
First Indicator
Undefined
# - Undefined
|
Second Indicator
148/448/548
-
Undefined
# - Undefined
748
-
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
$a - Chronological term (NR)
Tracing and linking subfields
$i - Reference instruction phrase (NR) [448/548]
$w - Control subfield (NR) [448/548/748]
$0 - Record control number (R) [548/748]
$2 - Source of heading or term (NR) [748]
$5 - Institution to which field applies (R) [448/548/748]
$6 - Linkage (NR)
$8 - Field link and sequence number (R)
| Subject subdivision portion
$v - Form subdivision (R)
$x - General subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
|
GUIDELINES FOR APPLYING CONTENT DESIGNATORS
Content designators identify the subelements occurring in chronological term headings
constructed according to generally accepted thesaurus-building conventions (e.g.,
Faceted Application of Subject Terminology (FAST)). Chronological terms
include dates that are used as the lead element of subject or added entry access fields
in bibliographic records. A chronological term that is authorized for use
only as a subject subdivision part of an extended subject heading is
contained in a 182 (Chronological Subdivision) 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 fields 448 and
548) and the 7XX Heading Linking Entries-General Information section (for field
748).
■ INDICATORS
First Indicator - Undefined Undefined and contains a blank (#).
Second Indicator In fields 148, 448, and 548, the second indicator position is undefined and
contains a blank (#). For field 748, the second indicator position contains one of
the values described in the
7XX Heading Linking Entries-General
Information section.
■ SUBFIELD CODES
$a - Chronological term Chronological term used as an entry element.
|
|
|
|
|
|
|
|
|
|
| 748 |
#7$a1710-1714$2fast |
| 748 |
#7$a1500-1700$2fast |
| 148 |
##$a1863 |
$i - Reference instruction phrase [448/548]Reference instruction phrase other than those that may be system generated from
the field tag or from the codes defined for subfield $w (Control subfield).
Subfield $i is appropriate only in field 448 and 548. Guidelines for applying
subfield $i are provided in the Tracings and References-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 X48 fields only
when a form subject subdivision is added to a main term to form an extended
heading.
$w - Control subfield [448/548/748]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 448, 548, and 748. Character position definitions and
guidelines for applying the codes defined for subfield $w in fields 448 and 548
are provided in the Tracings and References-General Information section.
Character position definitions and guidelines for field 748 are provided in the
7XX Heading Linking Entries-General Information section.
|
|
|
|
|
|
|
|
|
|
| 748 |
#7$a1710-1714$2fast$wna |
$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 X48 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 X48 fields only when a chronological subject subdivision is added to the
main term to form an extended heading.
$z - Geographic subdivision Appropriate in the X48 fields only when a geographic subject subdivision is added
to a main term to form an extended heading.
$0 - Record control number [548/748]
$2 - Source of heading or term [748]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 748.
Guidelines for applying subfield $2 are provided in the
7XX Heading Linking
Entries—General Information section.
|
|
|
|
|
|
|
|
|
|
| 748 |
#7$a1900-1999$2fast |
| 748 |
#7$a1800-1899$2fast |
$5 - Institution to which field applies [448/548/748]
$8 - Field link and sequence number
INPUT CONVENTIONS
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
X48 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. A data element that contains an open-ended date ends with one space when it is
followed by a subject subdivision.
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.