[Koha-bugs] [Bug 30280] New: Koha does not currently support authority posts with common subject headings from different thesaurus

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30280

            Bug ID: 30280
           Summary: Koha does not currently support authority posts with
                    common subject headings from different thesaurus
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: MARC Authority data support
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: frank.hansen at ub.lu.se
        QA Contact: testopia at bugs.koha-community.org

Consider this three following examples
650 _ 0 $a Feminism
650 _ 7 $a Feminism $2 sao
650 _ 7 $a Feminism $2 barn

The first example above is the LCSH term. The two other sao (controlled Swedish
subject heading system) and barn (Swedish children subject heading system).
These three using basically the same TOPIC_TERM Feminism but they belongs to
different thesaurus. According to https://www.loc.gov/marc/authority/ (Library
of Congress), subject heading thesaurus/system is specified in 008/11 in the
authority record. When other thesaurus/system is used, the value of 008/11 is
"z" (Other) and the convention used is marked up in field 040$f. But Koha
currently not seems to support the use of different thesaurus. The script
link_bibs_to_authorites.pl will treat authority records with the same
TOPIC_TERM from different thesaurus as duplicates and will not be able to link
the subject heading to its corresponding authority record. 

We would like if Koha could let authority records from different thesaurus
co-exist in Koha and "learn" Koha how to distinguish between them.

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