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Barcodes missing checksum digit

by Aurélien Mino :: Rate this Message:

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Hi,

I would like to know opinions on how we should handle barcode for
releases which have an invalid transcribed barcode.

Example:
http://musicbrainz.org/release/cf2439be-e928-47da-b260-64c072c70282.html 
(see scanned back cover:
http://jarremuseum.online.fr/revoluti/837421-2/version1/back.jpg).
The human readable barcode is "4228374212", which is not a valid barcode
per say: it misses the last checksum digit "3" and the leading 0.
However if you use a barcode reader, you'll get "042283742123".

Another example is
http://musicbrainz.org/release/12914d15-dfec-48ed-af2c-88dbaa830ec0.html.
I got the complete barcode from Amazon, but it seems that the checksum
digit doesn't appear on back cover:
http://musicbrainz.org/show/edit/?editid=10075712 and
http://musicbrainz.org/show/edit/?editid=10130431

So either we:
1. Kept what is written on the back cover ("4228374212")
2. Or save the correct barcode ("042283742123") in database, which can
be retrieved e.g. with http://users.musicbrainz.org/~luks/ean.html from
the incomplete barcode.

I would go for solution #2, since otherwise the barcode information
won't be computer-usable. I'm thinking about people using a barcode
reader on the release, e.g. libraries.

- Aurélien / murdos

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