Library of Congress >> MARC >> Community Information >> 01X-08X >> 080

080 - Universal Decimal Classification Number (NR)

MARC 21 Community Information - Full
January 2000

First Indicator
# - Undefined

Second Indicator
# - Undefined

Subfield Codes
$a - Universal Decimal Classification number (R)
$b - Item number (NR)
$x - Common auxiliary subdivision (R)
$2 - Edition identifier (NR)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)


Classification number that is assigned from Universal Decimal Classification.

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.




$a - Universal Decimal Classification number
110 2#$aAmerican Youth Soccer Organization.
080 ##$a796.332
$b - Item number
Item number portion of the UDC number. An item number is a Cutter, date, term, etc. added to a classification number to distinguish one item from any other assigned the same classification number.
$x - Common auxiliary subdivision
Common auxiliary subdivision, a number that qualifies the concept represented by the main UDC number. Common auxiliary subdivisions, such as those for form (e.g., dictionaries), are attached to a main UDC number preceded or delimited by some kind of facet indicator. Examples of commonly used subdivision delimiters are parentheses, brackets, an apostrophe, or a hyphen.
080 ##$a821.113.1$x(494)$2[edition information ]
080 ##$a94$x(474)$x”19"$x(075)$2[edition information]
$2 - Edition identifier
Edition number, date, or other textual designation of the edition of UDC used to compose the classification number.
080 ##$a82:111.852$21993
080 ##$a821.113.4-14$21998
$6 - Linkage
See the description of this subfield in Appendix A: Control Subfields.
$8 - Field link and sequence number
See the description of this subfield in Appendix A: Control Subfields.

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