754 Index Term - Faceted Topical Terms

Field definition and scope:

Field 754 contains a topical subject constructed from a faceted vocabulary. For each term found in the field, an identification is given as to the facet / hierarchy in the thesaurus from which the term came. In addition, identification is given as to which term is the focus term of the expression.

Field 754 is repeatable.

Guidelines for applying content designators:

Field 754 parallels the 654 Subject Added Entry field in the bibliographic format. The indicators and subfield codes below were created from the information in field 654. Guidelines for the input conventions, examples, and the source for the content designators are in MARC 21 Format for Bibliographic Data: 654 (Subject Added Entry - Faceted Topical Term).

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 754	Index Term - Faceted Topical Terms	R
Indicator:
First	Level of subject
#	No information provided
0	No level specified
1	Primary
2	Secondary

Second	Undefined; contains a blank

Subfield code:
$a	Focus term	R
$b	Non-focus term	R
$c	Facet/hierarchy designation	R
$v	Form 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
$3	Materials specified	NR
$6	Linkage	NR
$8	Field link and sequence number	R

Content designator history:

Subfield $0 - Authority record control number [new, 2007]

Subfield $0 - Authority record control number redefined, 2010]

Subfield $1 - Real World Object URI [new, 2017]