Tracing Fields (Tracing and Reference Fields - General Information )
Tracing fields lead directly from one heading to a single other heading.
A 4XX
See From tracing field leads from an unauthorized heading to an authorized heading.
A 5XX
See Also From tracing field leads from one authorized heading to another authorized heading.
The 4XX and 5XX fields are used only in established heading
records and subdivision records
.
Cross reference displays generated from the tracing fields are called simple cross references. In a simple cross reference display, the content of the 4XX or 5XX field is the heading referred from, and, following a reference instruction phrase, the content of the 1XX field is the heading referred to.
In the tracing fields, the reference instruction phrase may be implicitly associated with either the field tag or a code in subfield $w/0 (Special relationship)
.
In unusual cases, the reference instruction phrase may be carried explicitly in subfield $i (Reference instruction phrase)
.
Examples:
008/09 a [established heading record]
100 1#$aDe Angelini, Anna
400 1#$aAngelini, Anna de
[Reference instruction phrase is associated with field tag 400.]
Cross reference display:
Angelini, Anna de
search under: De Angelini, Anna
008/09 d [subdivision record]
180 ##$xAcronyms
580 ##$xAbbreviations
[Reference instruction phrase is associated with field tag 580.]
Cross reference display:
Abbreviations
search also under: Acronyms
See also:
Tracing Fields: Simple Cross References
Reference Note Fields: Complex Cross References
To return:
Use the 
key.