[Koha-bugs] [Bug 14287] New: Preserve valid ISBN-13 identifiers if they start with something else than 978

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=14287

            Bug ID: 14287
           Summary: Preserve valid ISBN-13 identifiers if they start with
                    something else than 978
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Cataloging
          Assignee: gmcharlt at gmail.com
          Reporter: olli-antti.kivilahti at jns.fi
        QA Contact: testopia at bugs.koha-community.org
                CC: m.de.rooy at rijksmuseum.nl

If Business::ISBN cannot make an ISBN-10 out of a valid ISBN-13 starting with
979, then we should preserve the ISBN-13 instead of getting rid of it.
ISBN-13 starting with 979 is valid as well and in a few years starting with 980
might be as well as the ISBN supply is running out.

This patch modifies the C4::Koha::NormalizeISBN() to preserve the original ISBN
if type conversion fails.

Also Koha should support all ISBN-variants interchangeably, see Bug 10192.
Some Items have ISBN-10 from some sources and the exact same Item can have
ISBN-13 from other valid sources.
Maybe the easiest solution is to migrate all current and future imported ISBNs
to ISBN-13 -variant since according to the same wikipedia article, the
conversion is quite easy.

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