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Adam L. Schiff <[log in to unmask]> wrote:
The MARC format (and OCLC Bib. Formats document) includes this example in field 344:

344 ## $a digital $b optical $g surround $h Dolby Digital 5.1 $2 rda

Adam''s example comes from here (look under the $b item):
<http://www.loc.gov/marc/bibliographic/bd344.html>

 
I think this has come up in discussion before, but can $2 rda be used in the 3XX fields if a term recorded does not come from a list in RDA? That is, since Dolby Digital 5.1 is not on the list in 3.16.9.3, is it correct to include $2 in the 344?  If not correct, should one 344 be used with no $2, or should two 344s be used as follows:

344 ## $a digital $b optical $g surround $2 rda
344 ## $h Dolby Digital 5.1

This follows my approach. The $2 is defined as the source for a list of controlled terms, to which I also include controlled units of measurement (ips, cm, MB).  Plenty of both in RDA.  Just recording something from the piece in hand, which this example might demonstrate, runs against the $2.

(Someone with more audio cataloging experience might address this option--and correct me if I'm wrong: use "Dolby" alone in the 344 $h with the $2 rda, and consider "Dolby Digital 5.1" the 3.16.9.4 "Details on..." comment posted elsewhere in the MARC record.)

While on this topic, also look at the example under 347 $e.  Though "region 4" is certainly based on RDA's instructions--that's what the 040 $e rda is for--the term itself doesn't come from any controlled list under RDA 3.19.6.  Nor is it based on any controlled labeling structure, like "# region."  I'd rewrite that example as:

347 ## $a video file $b DVD video $2 rda
347 ## $e region 4


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