X48 - Chronological Terms-General Information
MARC 21 Authority
October 2009
"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 |
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Subfield Codes
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Main term portion
$a - Chronological term (NR)
Tracing and linking subfields
$i - Relationship information
(R) [448/548]
$w - Control subfield (NR) [448/548/748]
$0 - Record control number (R) [548/748]
$2 - Source of heading or term (NR) [748]
$4 - Relationship code (R)
[448/548]
$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
$a - Chronological term
Chronological term used as an entry element.
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| 748 |
#7$a1710-1714$2fast |
| 748 |
#7$a1500-1700$2fast |
| 148 |
##$a1863 |
$i - Relationship
information [448/548]
Designation of a relationship of the
entity in a 448 or 548 field to the 1XX entity in the
record or a textual reference instruction phrase 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 fields 448 and 548. Guidelines
for using 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
$w in fields 448 and 548 are provided in the Tracings
and References-General Information section. Character
position definitions and guidelines for field 748 are
provided in the 7XX Heading Linking Entries-General
Information section.
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| 748 |
#7$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 $2 are provided in the
7XX Heading Linking Entries-General
Information section.
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| 748 |
#7$a1900-1999$2fast |
| 748 |
#7$a1800-1899$2fast |
$4 - Relationship code [448/548]
Contains in coded form the
designation of a
relationship of the entity in a 448 or 548 field to
the 1XX entity in the record. Guidelines for using subfield
$4 are provided in the
Tracings and References-General
Information section.
$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.
CONTENT DESIGNATOR HISTORY
$i - Relationship information
[448/548] [REDEFINED, 2009]
$4 - Relationship code [448/548]
[NEW, 2009]