Revision of the guidelines for the use of ISO 639-3 language codes in MARC records

The guidelines that instruct Program for Cooperative Cataloging (PCC) catalogers working in shared cataloging environments to encode all languages using MARC language codes and, optionally, also using ISO 639-3 language codes have been revised. However, it is possible that in the future, macros and other automated means will be developed to generate MARC language codes if catalogers have manually entered ISO 639-3 codes, eliminating the need for double coding.