768 Citation and Preference Order Instructions

Field definition and scope:

Field 768 contains a note or table with instructions about the order in which elements are to be applied in synthesizing a classification number or instructions about preference for the classification of different characteristics of a topic.

Field 768 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 768	Citation and Preference Order Instructions	R
Indicator:
First	Type of instruction
0	Citation and preference order note
1	Table of preference

Second	Undefined; contains a blank

Subfield code:
$a	Classification number - single number or beginning number of span	R
$c	Classification number - ending number of span	R
$e	Example class number	R
$i	Explanatory text	R
$j	Caption	R
$n	Negative example class number	R
$t	Topic used as example of citation and preference order instruction	R
$x	Exception to table of preference	R
$y	Table sequence number for internal subarrangement or add table	R
$z	Table identification - Table number	R
$6	Linkage	NR
$8	Field link and sequence number	NR

See: Examples for this field.

Scheme-specific conventions:

Dewey Decimal Classification

Content designator history:

Subfield $y - Table sequence number for internal subarrangement or add table [new, 2008]