Topical subject entry constructed from a faceted vocabulary.
Indicators
First - Level of subject
# - No information provided
0 - No level specified
1 - Primary
2 - Secondary
Second - Undefined
# - Undefined
Subfield Codes
$a - Focus term (NR)
$b - Non-focus term (R)
Term other than that considered the focus.
$c - Facet/hierarchy designation (R)
Designation used by the thesaurus specified by the MARC code contained in subfield
$2 to identify the facet/hierarchy for each term contained in subfields
$a and $b. Subfield $c always precedes the data
to which it is associated.
$v - Form subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
$0 - Authority record control number or standard number (R)