080 Universal Decimal Classification Number

Field definition and scope:

Field 080 contains a Universal Decimal Classification (UDC) number. The Universal Decimal Classification was developed from the Dewey Decimal Classification (DDC) scheme beginning in 1895. In the intervening years, the two systems have become very different in arrangement and philosophy. The UDC may be distinguished from the DDC by its extensive expansions, especially in classes 5 and 6 (science and technology), and by its use of various symbols in addition to Arabic numbers and a single decimal point.

Field 080 is repeated to record multiple UDC numbers assigned to an item.

The National level record requirement for this field is Optional.

Field 080 is repeatable.

Guidelines for applying content designators:

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 080	Universal Decimal Classification Number	O	O	R
Indicator:
First	Type of edition	M
#	No information provided	A
0	Full	A
1	Abridged	A

Second	Undefined; contains a blank	M

Subfield code:
$a	Universal Decimal Classification number	M	O	NR
$b	Item number	A	O	NR
$x	Common auxiliary subdivision	A	O	R
$0	Authority record control number or standard number	O	O	R
$1	Real World Object URI			R
$2	Edition identifier	A	O	NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Content designator history:

First Indicator - Type of edition [new, 2009]

Values # - No information provided [new, 2009]

0 - Full [new, 2009]

1 - Abridged [new, 2009]

Prior to 2009, the first indicator was undefined.

Subfield $0 - Authority record control number or standard number [new, 2017]

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