[Koha-bugs] [Bug 29434] New: In UNIMARC instances, the authority finder uses MARC21 relationship codes

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=29434

            Bug ID: 29434
           Summary: In UNIMARC instances, the authority finder uses MARC21
                    relationship codes
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: MARC Authority data support
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: a.roussos at dataly.gr
        QA Contact: testopia at bugs.koha-community.org

Background information
----------------------
As per the IFLA UNIMARC Manual for Authorities format [1], the 5--
Functional Block (a.k.a. Related Access Point Block) "contains related
authorized access points from which a reference is to be made to see also
the access point of the record".

To put it simply, this allows for linking authority records with other
authority records in order to form, for example, broader/narrower term
hierarchies (see sreenshots 1 and 2).

Control Subfield $5 ("Relationship Control" in IFLA speak, whereas the
UNIMARC Authorities framework in Koha uses the term "Tracing Control")
is key to this idea, because it is used to store a single-character value
that denotes the type of relationship between the authorities being linked.

The actual problem
------------------
When using the authority finder plugin (authorities/auth_finder.pl),
you can pick an entry from the 'Special relationship:' dropdown menu
in order to set the relationship between authorities.

However, in UNIMARC instances the relationship codes listed are those
for MARC21 [2] (see screenshots 3 and 4). The correct codes for UNIMARC
are listed in pages 93-94 of the IFLA UNIMARC Manual for Authorities.

[1] https://repository.ifla.org/handle/123456789/861
[2] https://www.loc.gov/marc/authority/adtracing.html

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