[Koha-bugs] [Bug 17233] Add 008 value builder plugin for MARC21 classifications

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17233

--- Comment #6 from Jacek Ablewicz <abl at biblos.pk.edu.pl> ---
As far as I know, for all practical purposes, classification records (or
"classification authority records" in other nomenclature) are authority
records, just slightly different kind than "ordinary" authority records.

LoC classification records are generally speaking, numeric classification
records (of different types: UDC, Dewey, and so on) controlled by an authority.
In MARC21 biblio records, classification numbers are typically in 08X fields,
and in the authority record, corresponding classification number is (usually ?)
in the heading field with 153 tag.

But, as Katrin said, for such "classification authority records" to be fully
functional in Koha, apart from user-configurable stuff like frameworks, zebra
indexes etc., you need to make some changes (additions) in the code too:

    - C4/Heading/MARC21.pm
    - C4/AuthoritiesMarc.pm

because tag numbers and subfields for a given authority types are hard coded in
there. For example (we are using UDC numerical classification in here), we
needed to add definitions for 080 and 153 tags in aforementioned files, because
they were not supported by default.

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