788 Complex Linking Entry Data

Field definition and scope:

Field 788 contains the explanatory text and the headings referred to when the linking relationship between headings from different subject heading systems or thesauri cannot be adequately conveyed by fields 700-785. No subelements of the heading referred to are separately subfield coded. Adjacent headings referred to may be contained in a single subfield $a. The heading referred to may be an established heading or a subject subdivision that is not equivalent to but is related to the heading in the 1XX field.

For example, the heading referred to may be restricted to being used as a subdivision in the related subject heading system/thesaurus, or, the related subject heading system/thesaurus may require the use of more than one heading to equal the concept expressed by the heading in the 1XX field of the record.

A link display may be generated from the 1XX and 788 field in a record.:

The 1XX field contains the heading referred from.

Field 788 contains the explanatory text for the reference and the other headings referred to.

Subfield $w/0 in any related 700-785 field(s) in the record contains code b (Link not displayed, field 788 used).

The National level record requirement for this field is Optional.

Field 788 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	Repeatability
Field 788	Complex Linking Entry Data	O	NR
Indicator:
First	Undefined; contains a blank	M

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

Subfield code:
$a	Heading referred to	M	R
$i	Explanatory text	M	R
$2	Source of heading or term	A	NR
$4	Relationship	O	R
$5	Institution to which field applies	A	R
$6	Linkage	A	NR
$8	Field link and sequence number	O	R

See: Examples for this field.

Input conventions:

Order of subfields

Relationship codes

Display constants for 7XX Linking Entries

Content designator history:

Subfield $4 - Relationship code [new, 2014]

Subfield $4 - Relationship code [renamed, 2017] [redescribed, 2017]: Subfield $4 was renamed to Relationship and redescribed to allow for the recording of relationship URIs in addition to MARC and non-MARC codes.

LC Guidelines:

788 Complex Linking Entry Data

DCM Z1 Instructions:

7XX Heading Linking Entries