Library of Congress >> MARC >> Authority >> 7XX >> 788

788 - Complex Linking Entry Data (NR)

MARC 21 Authority - Full

October 1999

First Indicator
Undefined
# - Undefined

Second Indicator
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
$a - Heading referred to (R) $i - Explanatory text (R) $2 - Source of heading or term (NR)	$5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

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 field and field 788 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).

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

■ INDICATORS

First Indicator - Undefined

Undefined and contains a blank (#).

Second Indicator - Thesaurus

Description of the second indicator is given in the 7XX Heading Linking Entries—General Information section.

■ SUBFIELD CODES

$a - Heading referred to

Heading from another thesaurus to which the heading in field 1XX of the record refers.

$i - Explanatory text

Text that describes the relationship between the heading referred to in subfield $a and the 1XX heading. The text may be broken up by subfield $a data and may be only a connector term such as and.

$2 - Source of heading or term

See Heading Linking Entries--General Information

$5 - Institution to which field applies

See description of this subfield in Appendix A: Control Subfields.

$6 - Linkage

See description of this subfield in Appendix A: Control Subfields.

$8 - Field link and sequence number

See description of this subfield in Appendix A: Control Subfields.

■ EXAMPLES

Same term used as established heading and as subject subdivision by different thesauri:


008/09	a [established heading record]
008/11	a [code indicating MeSH]
150	##$aForeign Bodies
780	#0$w#$xForeign bodies [LCSH subdivision]
788	#0$isubdivision$aForeign bodies$iunder names of organs, e.g.$aEye-Foreign bodies

Two established heading terms in one thesaurus are equivalent to one established heading in another thesaurus:


008/09	a [established heading record]
008/11	a [code indicating LCSH]
150	##$aFurniture$zChina
450	##$aFurniture, Chinese
750	#7$81$wb$aChinese$2aat
750	#7$81$wb$afurniture$2aat
788	#7$iterms$aChinese$iand$aFurniture$iare separate facets.$2aat

Library of Congress >> MARC >> Authority >> 7XX >> 788

(03/06/2008)