765 Synthesized Number Components

Field definition and scope:

Field 765 contains information about how a synthesized number or a portion of a synthesized number was built. It traces the different components of a synthesized number, showing the different portions of the number and where the add instructions are given. If a number was built using two or more instructions, a separate field 765 is given for each instruction.

The information in this field is primarily intended to serve as a tracing of how classification numbers are synthesized to assist classifiers. It facilitates computer manipulation of synthesized numbers, both for validation that the numbers have been synthesized correctly and for index-building, to allow searching every use of a specific number.

A synthesized number in field 153 (Classification Number) may be identified by code b in 008/12 (Synthesized number indication). Synthesized numbers may also appear in other fields.

Field 765 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 765	Synthesized Number Components	R
Indicator:
First	Field of number analyzed
0	153 field
1	Other field

Second	Undefined; contains a blank

Subfield code:
$a	Number where instructions are found - single number or beginning number of span	R
$b	Base number	R
$c	Classification number - ending number of span	R
$f	Facet designator	R
$r	Root number	R
$s	Digits added from classification number in schedule or external table	R
$t	Digits added from internal subarrangement or add table	R
$u	Number being analyzed	R
$v	Number in internal subarrangement or add table where instructions are found	R
$w	Table identification - internal subarrangement or add table	R
$y	Table sequence number for internal subarrangement or add table	R
$z	Table identification	R
$6	Linkage	NR
$8	Field link and sequence number	R

See: Examples for this field.

Input conventions:

Order of subfields

Scheme-specific conventions:

Dewey Decimal Classification

Content designator history:

Subfield $c - Classification number - ending number of span [redefined, 2008]

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