Tracings and References - General Information for 2XX-5XX (Variable Data Field )

Definition and scope: A cross reference is used to refer between classification numbers that are constructed according to the classification scheme that is identified in field 084 (Classification Scheme and Edition) . It leads from an invalid classification number to a valid classification number or from one valid classification number to another valid classification number. Tracings or reference note fields are used to direct the user to another classification number, often for specific aspects of a topic. Cross reference displays may be generated by combining the contents of a tracing or a reference note field and field 153 (Classification Number) of a record. In some cases, the inputting library may provide both a tracing and a reference note field and choose to suppress the tracing for display purposes.

For a quick look at how to use this section, see: Synopsis . Or, for additional information on the Tracing and Reference fields, select:

Tracing fields and simple cross references

Subfield codes for Tracing fields (Guidelines for applying content designators )

Reference note fields and complex cross references

Conventions: Input Conventions

Scheme-Specific Conventions

Reference fields:

253 Complex See Reference (R)

353 Complex See Also Reference (R)

Tracing fields:

453 Invalid Number Tracing (R)

553 Valid Number Tracing (R)

Related USMARC fields or documents:

084 Classification Scheme and Edition

X53 Classification Numbers - General Information

685 History Note

See also:

2XX-5XX Tracings and References: Contents

Variable Data Fields