Library of Congress >> MARC >> Classification >> 76X >> 764

764 - Rule Identification (R)

MARC 21 Classification - Full
January 2000
First Indicator
Undefined
# - Undefined

Second Indicator
Undefined
# - Undefined

Subfield Codes
$a - Rule number (NR)
$i - Explanatory text (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Identification of a rule number that is used to build a number by applying a table. Each unique rule number may be translated into a sequence of steps used by a system to calculate the number in classification schemes that have multiple rules for building specific classification numbers.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

■ SUBFIELD CODES

$a - Rule number
Identifies a particular rule that is used to apply a specific table to a classification number or span in a classification scheme that has multiple number building rules.
The subfield is input in the first record in the table to which it applies, and may be used by a system to automatically calculate a synthesized number by following a sequence of steps.
153 ##$zKFA-KFZ$a1$c599.5$jUnited States - States and Territories
764 ##$a2$iSubtract 1 from number in 153/a and add table number to resulting number
$i - Explanatory text
Textual form of the rule as a sequence of steps to be followed in building a number from a table applied to a classification number span.
153 ##$zH3$a1$c295$jTables of geographical divisions
764 ##$a1$iAdd table number to number in 153/a or to number specified in 761/b if present
$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.

SCHEME-SPECIFIC CONVENTIONS

Library of Congress Classification - Data in subfield $a is a numeric, identifying a rule to be applied.
Library of Congress >> MARC >> Classification >> 76X >> 764
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