MARC 21 Format for Authority Data: 785: Subdivision Linking Entry-Form Subdivision (Network Development and MARC Standards Office, Library of Congress)

785 - Subdivision Linking Entry-Form Subdivision (R)

MARC 21 Authority - full

December 2017

First Indicator	Second Indicator
Undefined # - Undefined	Thesaurus 0 - Library of Congress Subject Headings 1 - LC subject headings for children's literature 2 - Medical Subject Headings 3 - National Agricultural Library subject authority file 4 - Source not specified 5 - Canadian Subject Headings 6 - Répertoire de vedettes-matière 7 - Source specified in subfield $2

First Indicator

Second Indicator

Undefined
# - Undefined

Thesaurus
0 - Library of Congress Subject Headings
1 - LC subject headings for children's literature
2 - Medical Subject Headings
3 - National Agricultural Library subject authority file
4 - Source not specified
5 - Canadian Subject Headings
6 - Répertoire de vedettes-matière
7 - Source specified in subfield $2


Subfield Codes
$i - Relationship information (R) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Link display /1 - Replacement complexity $x - General subdivision (R) $y - Chronological subdivision (R) $z - Geographic subdivision (R) $0 - Authority record control number or standard number (R)	$1 - Real World Object URI (R) $2 - Source of heading or term (NR) $4 - Relationship (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)

Subfield Codes

$i - Relationship information (R)
$v - Form subdivision (R)
$w - Control subfield (NR)
/0 - Link display
/1 - Replacement complexity
$x - General subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
$0 - Authority record control number or standard number (R)

$1 - Real World Object URI (R)
$2 - Source of heading or term (NR)
$4 - Relationship (R)
$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Form subdivision term that is equivalent to the 155 genre/form or 185 form subdivision field of the same record. It links headings within a system or from different thesauri or authority files.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

Most of the content designators defined for field 785 are the same as those defined for field 185 (Heading-Form Subdivision), field 485 (See From Tracing-Form Subdivision), and field 585 (See Also From Tracing-Form Subdivision). Description, guidelines, and input conventions for shared content designators are given in the X85 Form Subdivisions-General Information section.

Guidelines for applying the second indicator, subfield $w (Control subfield), subfield $2 (Source of heading or term), subfield $i (Relationship information), and subfield $4 (Relationship) in field 785 are given in the 7XX Heading Linking Entries-General Information section.

■ EXAMPLES

Established heading genre/form term is also used as a form subdivision; no separate subdivision record:

008/09	a [established heading record]
008/11	a [code indicating LCSH]
155	##$aPeriodicals
785	#0$wa$vPeriodicals

(12/18/2017)