he NLM Cataloging Section implemented the 2004 amendments to the Anglo-American Cataloguing Rules, 2nd edition, 2002 revision, in September 2004. Most changes, this year, consist of clarifications to and amplifications of existing rules. Some rules have been renumbered.

A new rule, AACR2 1.0A3, has been added to give a fuller explanation of the chief source of information for bibliographic description. Corresponding material-specific rules have been modified in chapters 2-12, and chapter 25 to reflect this new rule.

New options have been provided for AACR2 6.5B1 and 7.5B1 to permit applying terms in common usage for the specific format of the physical carrier. For the present, NLM will not apply these options, pending a decision of the Program for Cooperative Cataloging (PCC).

AACR2 rule 9.3 has been deleted. Data for "type and extent of resource" will not be provided for electronic resources.

AACR2 9.5B1 provides an option to permit applying terms in common usage to describe the specific physical carrier of direct access electronic resources (e.g., CD-ROM, DVD-ROM). For the present, NLM will not apply this option, pending a decision of the PCC.

AACR2 9.5B3 provides an option to record the extent of item for remote access electronic resources (e.g., 1 electronic text). For the present, NLM will not apply this option, pending a decision of the PCC.

AACR2 12.0B1 has been amended to address both numbered and unnumbered serials explicitly.

AACR2 12.1E1 eliminates the distinction between the rules for recording "other title information" for serials and integrating resources.

The concept of "predominant title" for multipart monographs has been eliminated resulting in changes to the following rules:

• AACR2 21.2A has been changed to state that, in all cases, if a change occurs in the title of a multipart monograph, the title of the first part is retained as the title proper, and later titles are given in a note.
• AACR2 21.3A2 has been revised to state that the original main entry is retained even when primary responsibility for subsequent parts changes.
• AACR2 21.29B has been revised to allow additional access to accommodate these changes.

Differing practices for integrating resources, compared to multipart monographs and serials, have been clarified in the following rules:

• AACR2 21.2B1 states that when the title of an integrating resources changes, the record is revised to replace the title proper.
• AACR2 21.3B states that when there is a change in primary responsibility for an integrating resource the record is revised to change the main entry.

By Evelyn S. Bain
Cataloging Section

Bain ES. National Library of Medicine^® (NLM) Adopts 2004 Amendments to Anglo-American Cataloguing Rules. NLM Tech Bull. 2004 Nov-Dec;(341):e2.