Section II - 4XX and 5XX Fields

4XX and 5XX Fields (Additions and Changes to Authority Records)

4XX and 5XX fields on existing NAF records may be added, deleted, and/or modified for various reasons, including:

1. adding a new 4XX/5XX field because a variant form of the heading has been encountered

2. deleting a 4XX/5XX field because it is no longer appropriate

3. modifying a 4XX/5XX field in order to reflect new information or make a correction

1. For guidelines on how and when to add or modify 4XX/5XX fields, see:

A. AACR2, chapter 26

B. LCRIs for chapter 26

C. DCM, section Z1

2. For information on formulating 4XX/5XX fields, see the section on New Authority Records -- 4XX/5XX Fields.

3. Many modifications to 4XX/5XX fields will also necessitate the addition of 670 and/or 675 fields. For information on formulating these fields, see the sections on New Headings -- 670 Field and New Authority Records -- 675 Field .

4. When adding or adjusting 4XX/5XX fields on an authority record, remember that the whole record must be brought up to date. Be sure to examine and if necessary, adjust all 4XX/5XX fields in the record. Indicate that the references have been evaluated by coding the Reference evaluation fixed field 008/29 a or n.

5. Routinely delete all subject-to-name references (field 550) when changing a record for another reason. (These references are no longer made; since existing references have not been maintained, they may not be in accord with current subject cataloging policy. Cf. DCM Z1, 5XX See Also From Tracings, p. 1)

6. Do not delete or change linking references in existing authority records.

7. When modifying an authority record for another reason, catalogers may delete any final mark of punctuation in a 4XX or 5XX field unless it is a part of the data (e.g., a period in an abbreviation) or is called for by the cataloging rules (e.g., a paranthetical qualifier).