Field definition and scope:

Field 686 contains information about the relationship of a number to the source edition when the number is different from the standard number for the same topic in the primary source edition.  This field is used for numbers based on a source other than the primary source, expansions, implemented options, and adaptations.  The information in this field is intended primarily for computer processing or to guide classifiers and is often not written in a form adequate for public user display.

Field 686 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 686

Relationship to Source Note

R

Indicator:

 

 

First

Type of relationship

 

0

Number from other source edition

 

1

Expansion

 

2

Option

 

3

Adaptation, other

 

 

 

 

Second

Undefined; contains a blank

 

 

 

 

Subfield code:

 

 

$a

Number in edition described in field 084 - single number or beginning number of span

R

$b

Number in primary source edition - single number or beginning number of span

R

$c

Ending number of span

R

$i

Explanatory note

R

$o

Number where instructions are found - single number or beginning number of span

R

$t

Topic

R

$y

Table sequence number for internal subarrangement or add table

R

$z

Table identification

R

$2

Edition identifier

R

$5

Institution to which field applies

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]

See also:

6XX  Notes

Variable Data Fields