654 Subject Added Entry - Faceted Topical Terms

Field definition and scope:

Field 654 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. A field may contain more than one expression.

The National level record requirement for this field is Mandatory if applicable.

Field 654 is repeatable.

Guidelines for applying content designators:

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

Position	Description	NLR	MLR	Repeatability
Field 654	Subject Added Entry - Faceted Topical Terms	A	O	R
Indicator:
First	Level of subject	M
#	No information provided	A
0	No level specified	A
1	Primary	A
2	Secondary	A

Second	Undefined; contains a blank	M

Subfield code:
$a	Focus term	A	O	R
$b	Non-focus term	A	O	R
$c	Facet/hierarchy designation	A	O	R
$e	Relator term	O	O	R
$v	Form subdivision	A	O	R
$y	Chronological subdivision	A	O	R
$z	Geographic subdivision	A	O	R
$0	Authority record control number or standard number	O	O	R
$1	Real World Object URI			R
$2	Source of heading or term	A	O	NR
$3	Materials specified	O	O	NR
$4	Relationship	O	O	R
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Punctuation

Display constant

Content designator history:

Subfield $e - Relator term [new, 2005]

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

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

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

Subfield $4 - Relator code [new, 2005]

Subfield $4 - Relator 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.