X30 Uniform Titles - General Information

Field definition and scope:

Each uniform title field is unique in its definition and scope. For specific information, select from the list below.

430 See From Reference - Uniform Title (R)

730 Established Heading Linking Entry - Uniform Title (R)

Record requirements: The National level record requirement for the uniform title fields is Mandatory if applicable, except for field 730 which is Optional. For the national level requirements by subfield, see the specific field.

Field repeatability: See the specific field for its repeatability.

Guidelines for applying content designators:

The content designators identify the subelements occurring in a title that identifies an item or a series that is not entered under a name in a name/title heading. The title is constructed according to the generally accepted cataloging and thesaurus-building rules [e.g., Anglo-American Cataloguing Rules (AACR 2), Library of Congress Subject Headings (LCSH)].

Uniform titles used in phrase subject headings (e.g., Bible and atheism) are contained in the X50 fields.

A title entered under a name is contained in subfield $t (Title of a work) in the field appropriate for the author's name (X00, X10, X11).

The indicators, subfield codes, and input conventions for the uniform title fields 130, 430, 530, and 730 follow similar patterns. Guidelines for applying them are below. Subfields are grouped by type of entry.

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below. An asterisk ( * ) in the column indicates that the requirement varies. See table in the specific field.:

Position	Description	NLR	Repeatability
Field X30	Uniform Titles	*	*
Indicator:
First	Undefined; contains a blank	M

Second
130, 430, 530	Nonfiling characters [130, 430, 530]	M
0	No nonfiling characters [130, 430, 530]	A
1-9	Number of nonfiling characters [130, 430, 530]	A

730	Thesaurus	M
0	Library of Congress Subject Headings/Name authority file	A
1	LC subject headings for children's literature	A
2	Medical Subject Headings/NLM name authority file	A
3	National Agricultural Library subject authority file	A
4	Source not specified	A
5	Canadian Subject Headings/LAC name authority file	A
6	Répertoire de vedettes-matière	A
7	Source specified in subfield $2	A

Subfield code:
	Title portion
$a	Uniform title	M	NR
$d	Date of treaty signing	A	R
$f	Date of a work	A	NR
$g	Miscellaneous information	A	R
$h	Medium	*	NR
$k	Form subheading	A	R
$l	Language of a work	A	NR
$m	Medium of performance for music	A	R
$n	Number of part/section of a work	A	R
$o	Arranged statement for music	A	NR
$p	Name of part/section of a work	A	R
$r	Key for music	A	NR
$s	Version	A	R
$t	Title of a work	A	NR

	Subject subdivision portion
$v	Form subdivision	A	R
$x	General subdivision	A	R
$y	Chronological subdivision	A	R
$z	Geographic subdivision	A	R

	Tracing and linking subfields
$i	Relationship information [430, 530, 730]	current - A earlier - A	R
$w	Control subfield [430, 530, 730]	A	NR
$0	Authority record control number or standard number [530, 730]	A	R
$1	Real World Object URI [530, 730]		R
$2	Source of heading or term [730]	A	NR
$4	Relationship [430, 530, 730]	O	R
$5	Institution to which field applies [430, 530, 730]	A	R
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

Input conventions:

Ambiguous headings (what is considered a "uniform title")

Punctuation

Spacing

Display constant for X30 fields

Content designator history:

Subfield $g - Miscellaneous information [changed, 2014]: In 2014, subfield $g was made repeatable.

Subfield $i - Reference instruction phrase [430, 530] [redefined, 2009]

Subfield $i - Relationship information [730] [new, 2014]

Subfield $s - Version [changed, 2017]: Subfield $s was made repeatable.

Subfields $u - Record control number [730] [obsolete, 1997] [USMARC only]

$v - Record control number [730] [redefined, 1995] [USMARC only]

$0 - Record control number [530, 730] [new, 1997]

$0 - Record control number [530, 730] [redefined, 2010]

$v - Form subdivision [redefined, 1995]

$3 - Authority record control number [obsolete, 1997] [CAN/MARC only]

In USMARC, from 1993 to 1995, subfield $v was defined as Record control number in the 7XX Heading Linking Entry fields. When subfield $v was adapted for form subdivisions in MARC bibliographic and authority heading fields in 1995, subfield $v was redefined as Form subdivision. In 1997, subfield $0 was added as Record control number in 5XX and 7XX fields and $u was made obsolete.

Subfield $1 - Real World Object URI [530, 730] [new, 2017]

Subfield $4 - Relationship code [430, 530] [new, 2009]

Subfield $4 - Relationship code [730] [new, 2014]

Subfield $4 - Relationship code [430, 530, 730] [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.