448 See From Tracing - Chronological Term

Field definition and scope:

Field 448 contains a tracing for a chronological term see from reference. It is used in an established heading record or an established heading and subdivision record to trace a see from reference from a chronological term not used to an established heading.

The National level record requirement for this field is Mandatory if applicable.

Field 448 is repeatable.

Guidelines for applying content designators:

The 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.

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	Repeatability
Field 448	See From Tracing - Chronological Term	A	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Chronological term	M	NR
$i	Relationship information	current - A earlier - A	R
$v	Form subdivision	A	R
$w	Control subfield	A	NR
	/0 Special relationship	O
	/1 Tracing use restriction	O
	/2 Earlier form of heading	O
	/3 Reference display	O
$x	General subdivision	A	R
$y	Chronological subdivision	A	R
$z	Geographic subdivision	A	R
$4	Relationship	O	R
$5	Institution to which field applies	A	R
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

See: Examples for this field.

Input conventions:

Punctuation

Spacing

Display constant for X48 fields

Display constants for cross references

Content designator history:

Subfield $i - Reference instruction phrase [redefined, 2009]: Subfield $i was renamed Relationship information and broadened to include relationship designations in addition to textual reference phrases. The subfield was changed from Not repeatable (NR) to Repeatable (R).

Subfield $w/0 - Special relationship

Code r - Relationship information in subfield $i or $4 [new, 2009]

Subfield $w/1 - Tracing use restriction

Code h - No reference structures [new, 2007]

Subfield $4 - Relationship code [new, 2009]

Subfield $4 - Relationship code [renamed, 2017] [redescribed, 2017]: Subfield $4 was renamed to Relationship and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.

LC Guidelines:

448 See From Tracing - Chronological Term

Tracings and References - 4XX Fields [General Information]