Using iso-639-1, iso-639-2/B or iso-639-3 is insufficient.
BCP47 includes subtag for language, script, region and variant as well as a series of extension mechanisms such as -t- sequences.
BCP47 also addresses duplication between iso-639-1, iso-639-2/T and iso-639-3.
On Saturday, 16 December 2017, Rebecca Guenther <[log in to unmask]
The need to be able to use ISO 639-1 and 639-3 language codes was recognized by the MARC community some time ago (actually in 2001), and there is a mechanism to record them in field 041, e.g.
041 07 $a en $a fr $2 iso639-1
I’m not sure how widely implemented it is. Subfield $2 contains the source of the code and the sources are in the list at http://www.loc.gov/standards/sourcelist/language.html
. At the time, the RFCs were being used (and as you can see from the list of source codes, they were revised a lot). BCP 47 could be added to the source code list so that it could be used in MARC records for now.
Most existing MARC data incorporates use of the language codes found in ISO 693-2/B. While the codes in this standard are useful, it may be necessary in implementation to accommodate the codes from ISO 639-1 (2-letter codes) and ISO 639-3 as well.
Adhering to BCP 47 would already provide a mechanism for expressing ISO 639-1 and 639-3 language codes, so I don't see why the implementation-level consideration is not simply to use BCP 47 as was already stated under General considerations.
Robert J. Rendall kirjoitti 13.12.2017 klo 22:30:
The ALA/ALCTS Committee on Cataloging: Asian and African Materials (CC:AAM) has voted to approve a Statement in Support of the Internationalization of BIBFRAME, containing recommendations on character encoding, the representation of original script and romanization, normalization, and language tags:
Chair, CC:AAM 2017-2018
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