| First Indicator Undefined # - Undefined |
Second Indicator Undefined # - Undefined |
| Subfield Codes |
|
| $a - Topical term or geographic name entry element (NR) $b - Topical term following geographic name entry element (NR) $i - Reference instruction phrase (NR) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Special relationship /1 - Tracing use restriction /2 - Earlier form of heading /3 - Reference display |
$x - General subdivision (R) $y - Chronological subdivision (R) $z - Geographic subdivision (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R) |
Tracing for a topical term see from reference.
Used in an established heading or established heading and subdivision record to trace a see from reference from a topical term not used in an established heading.
Most of the content designators defined for field 450 are the same as those defined for field 150 (Heading-Topical Term), field 550 (See Also From Tracing-Topical Term), and field 750 (Established Heading Linking Entry-Topical Term). Description, guidelines, and input conventions for shared content designators are given in the X50 Topical Terms-General Information section.
Guidelines for applying the subfield $w (Control subfield) and subfield $i (Reference instruction phrase) in field 450 are given in the Tracings and References-General Information section.
| 150 | ##$aAfrican drama (English) | ||||||||
| 450 | ##$aEnglish drama$xAfrican authors | ||||||||
| 150 | ##$aMusic$xTheory$y15th century | ||||||||
| 450 | ##$aMusic$y15th century$xTheory | ||||||||
| 150 | ##$aGrammar, Comparative and general$xExclamations | ||||||||
| 450 | ##$aExclamations (Linguistics) | ||||||||
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