180 Heading - General Subdivision

Field definition and scope:

Field 180 contains a topical or language term used as a heading in a subdivision record.

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

Field 180 is NOT repeatable.

Guidelines for applying content designators:

The content designators identify the subelements occurring in general subdivision headings constructed according to generally accepted thesaurus-building conventions (e.g., Library of Congress Subject Headings, Medical Subject Headings).

A general subdivision may be a topical or language term that is used as a subdivision portion of an extended subject or index term access field in bibliographic records.

A topical or language term that is used as the lead element of an established heading record is contained in a 150 (Heading - Topical Term) 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 180	Heading - General Subdivision	A	NR
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$v	Form subdivision	A	R
$x	General subdivision	M	R
$y	Chronological subdivision	A	R
$z	Geographic subdivision	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

LC Guidelines:

180 Heading - General Subdivision