630 Subject Added Entry - Uniform Title

Field definition and scope:

Field 630 contains a subject added entry in which the entry element is a uniform title. Subject added entries are assigned to a bibliographic record to provide access according to established subject cataloging principles and guidelines. Field 630 may be used by any institution assigning subject headings based on the lists and authority files identified in the second indicator position or in subfield $2 (Source of heading or term).

A title used in phrase subject headings (e.g., Bible and atheism) is contained in field 650 (Subject Added Entry - Topical Term).

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

Field 630 is repeatable.

Guidelines for applying content designators:

The content designators identify the subelements occurring in uniform or conventional title, title page title, or series title headings that are not entered under a name in a name/title heading and that are 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)].

A uniform title heading is used to bring together bibliographic entries for a work when various issues have appeared under different titles and to provide identification for a work when the title by which it is known differs from the title proper of a particular issue or when different publications have identical titles.

A uniform title entered under a name is contained in field 240 or in subfield $t (Title of a work) in the field appropriate for the author's name (X00 Personal Names, X10 Corporate Names, X11 Meeting Names).

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

Position	Description	NLR	MLR	Repeatability
Field 630	Subject Added Entry - Uniform Title	A	O	R
Indicator:
First	Nonfiling characters	M
0	No nonfiling characters present	A
1-9	Number of nonfiling characters present	A

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

Subfield code:
$a	Uniform title	M	O	NR
$d	Date of treaty signing	A	O	R
$e	Relator term	O	O	R
$f	Date of a work	A	O	NR
$g	Miscellaneous information	A	O	R
$h	Medium	O	O	NR
$k	Form subheading	A	O	R
$l	Language of a work	A	O	NR
$m	Medium of performance for music	A	O	R
$n	Number of part/section of a work	A	O	R
$o	Arranged statement for music	A	O	NR
$p	Name of part/section of a work	A	O	R
$r	Key for music	A	O	NR
$s	Version	A	O	R
$t	Title of a work	A	O	NR
$v	Form subdivision	A	O	R
$x	General subdivision	A	O	R
$y	Chronological subdivision	A	O	R
$z	Geographic subdivision	A	O	R
$0	Authority record control number or standard number	O	O	R
$1	Real World Object URI			R
$2	Source of heading or term	A	O	NR
$3	Materials specified	O	O	NR
$4	Relationship	O	O	R
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

See: Examples for this field.

Input conventions:

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

Punctuation

Spacing

Display constant

Initial articles (includes information on diacritics or special characters)

Content designator history:

First indicator - Nonfiling characters

Values # - Undefined [obsolete, 1979]

# - Nonfiling characters not specified [obsolete, 1980]

The number of character positions associated with a definite or indefinite article at the beginning of a uniform title field that are disregarded in sorting and filing processes was not specified prior to the definition of the first indicator position in 1979.

The interpretation of a # (blank) to indicate that the number of nonfiling characters is not specified was made obsolete in 1980. Pre-1979 records may contain a # (blank) meaning undefined in this position.

Subfield $d - Date of treaty signing [new]: The date of signing of a treaty was not separately subfield coded prior to the definition of subfield $d in 1980.

Subfield $e - Relator term [new, 2005]

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

Subfields $n - Number of part/section of a work [new]

$p - Name of part/section of a work [redefined]

In 1979, subfield $n was defined for numbered parts/sections and subfield $p (Part) was redefined to include only named parts/sections. Prior to that change, both the number and the name of a part were contained in one $p subfield.

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

Subfield $0 - Authority record control number [new, 2007]

Subfield $0 - Authority record control number [redefined, 2010]

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

Subfield $4 - Relator code [new, 2005]

Subfield $4 - Relator 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.