253 Complex See Reference (R) (Variable Data Field)
Field definition and scope: This field contains explanatory text and the Classification number referred to that are required when a see reference relationship exists between classification numbers that cannot be adequately conveyed by one or more simple cross references generated from a 453 or 553 tracing field. A see also reference that directs the user to a related number is contained in field 353 (Complex See Also Reference) .
A cross reference display may be constructed from the 153 and 253 fields of the record. Field 153 (Classification Number) contains the classification number or span referred from. Field 253 contains the explanatory text for the reference and the other classification number(s) or span(s) referred to. When several reference notes are associated with a classification number, each may be recorded in a separate field or they may be combined and recorded in a single field. References providing information about use of numbers discontinued in whole or in part for a topic and about topics relocated in whole or in part to other numbers are contained in field 685 (History Note) .
Field 253 is repeatable .
Guidelines for applying Content Designators:
Indicators
1 Standard subdivisions do-not-use reference
Second Undefined; contains a blank (#)
Subfield Codes
$a Classification number referred to - Single number or beginning number of span (R)
$c Classification number referred to - Ending number of span (R)
$i Explanatory text (R)
$y Table identification - Schedule (R)
$z Table identification - Table number (R)
Conventions: Input Conventions
Related USMARC fields or documents:
084 Classification Scheme and Edition
X53 Classification Numbers - General Information
See also:
2XX-5XX Tracings and References: Contents
