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.

630 Subject Added Entry - Publication Title (R)

The X30 fields are repeatable.

Guidelines for applying content designators:

The content designators identify the subelements occurring in uniform or conventional titles, 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) and 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 245 or in subfield $t (Title of a work) in the field appropriate for the author's name (X00, X10, X11). Uniform titles used in phrase subject headings (e.g., Bible in atheism) are contained in field 650 (Subject Added Entry - Topical Term).

Guidelines for applying all content designators except the second indicator position are given in this section. A field-specific list of content designators and guidelines for applying the second indicator position are provided under the description for each specific X30 field.

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

Position	Description	Repeatability
Field X30	Uniform Titles	R
Indicator:
First	Nonfiling characters
0	No nonfiling characters present
1-9	Number of nonfiling characters present

Second	See the specific X30 field.

Subfield code:
	Title portion
$a	Title	NR
$f	Date of a work	NR
$n	Number of part/section of a work	R
$p	Name of part/section of a work	R
$s	Version	NR

	Subject subdivision portion
$v	Form subdivision [630]	R
$x	General subdivision [630]	R
$y	Chronological subdivision [630]	R
$z	Geographic subdivision [630]	R

	Control subfields
$0	Authority record control number or standard number	R
$1	Real World Object URI	R
$2	Source of heading or term [630]	NR
$6	Linkage	NR
$8	Field link and sequence number	R

Input conventions:

Content designator history:

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

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

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