Control Subfield $w for Cross References (New Authority Records)

It is necessary to include a control subfield ($w) for some types of cross references. Note that no control subfield is necessary for simple cross references. The control subfield should be the first element in the 4XX or 5XX field. It will be followed by $a and the text of the cross reference.

Linking References from Pre-AACR2 Headings:

(Note: Linking references from pre-AACR2 headings are now optional. OCLC NACO participants should not code the control subfield to indicate a linking reference from a pre-AACR2 heading unless they have verified that form in the LC database.)

These three control subfields indicate a linking reference (see Linking References for fuller definition)

4XX $w nna This indicates that the cross reference was a heading which was found in a pre-AACR2 LC record in RLIN or OCLC (known as an "old catalog heading" at LC), and is in a form compatible with AACR2 practice.

4XX $w nnaa This indicates that the cross reference was a heading which was found in a pre-AACR2 LC record in RLIN of OCLC but it is in a form incompatible with AACR2 practice.

References from former AACR2 heading:

4XX $w nne This indicates that the cross reference was formerly an AACR2 or AACR2 AACR2 compatible heading on an existing record.

Earlier/Later References:

The following two possibilities are used only for corporate name 5XX fields when there are earlier/later headings (see section on Earlier/Later References for fuller definition):

5XX $w a This is used only for 5XX fields which indicate that the cross reference is an earlier name of the corporate body.

5XX $w b This is used only for 5XX fields which indicate that a cross reference is a later name of the corporate body.

If NACO participant is unsure about what code the subfield should contain, he should consult the proper USMARC, RLIN, or OCLC documentation, or contact the Coop Cat liaison.

See also:

Section I - New Authority Records