Used
in an established record to trace a see also reference from a
topical term to a related established heading.
Subfield Codes
$a - Topical term
entry element (NR)
In UNBIS, the complete topical term is entered in $a.
$w
- Control subfield (NR)
In UNBIS, $w contains a one-character
alphabetic code that describes a special relationship between the
heading in a 1XX field and a heading in a
5XX
field. [Note: currently displayed in recent Horizon records]
g
- Broader heading
h
- Narrower heading
Examples:
150
$a
OLYMPIC GAMES
550 $a SPORTS
550 $a GAMES
150 $a ECONOMIC, SOCIAL AND CULTURAL RIGHTS
550 $w g $a HUMAN RIGHTS
550 $w h $a FAMILY RIGHTS
550 $w h $a RIGHT TO EDUCATION
550 $w h $a RIGHT TO FOOD
550 $w h $a RIGHTS OF THE CHILD
550 $w h $a TRADE UNION RIGHTS
150 $a ECONOMICS
550 $w g $a SOCIAL SCIENCES
550 $w h $a AGRICULTURAL ECONOMICS
550 $w h $a COMPARATIVE ECONOMICS
550 $w g $a ECONOMETRICS
550 $a ECONOMIC
GEOGRAPHY
550 $a ECONOMIC HISTORY
550 $a ECONOMISTS
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