764 - Rule Identification (R)
MARC 21 Classification - Concise
2007
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.
Indicators
First - Undefined
# - Undefined
Second - Undefined
# - Undefined
Subfield Codes
$a - Rule number (NR)
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.
$i - Explanatory text (R)
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.
$8 - Field link and sequence number (R)
Examples
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| 764 |
##$a2$iSubtract 1 from number in 153/a and add table number to
resulting number
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| 764 |
##$a1$iAdd table number to number in 153/a or to number
specified in 761/b if present
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