[Koha-bugs] [Bug 24675] No update of the list of MARC21 subfields in C4/Heading/MARC21.pm, Generated authorities are missing subfields

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=24675

Phil Ringnalda <phil at chetcolibrary.org> changed:

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--- Comment #7 from Phil Ringnalda <phil at chetcolibrary.org> ---
The actual situation with $e is even weirder, because although LC chooses not
to use it, $e is actually defined for authority 100 tags in
http://www.loc.gov/marc/authority/ad100.html but it isn't defined for what you
would expect. 

Instead, as documented in http://www.loc.gov/marc/authority/adx00.html it's the
relator between the $a and the $t in a name/title heading. So if you were
cataloging according to MARC but not according to LC, you could have an "800 1#
$aThunkitup, John,$ecreator$tOthers write John's characters series", and when
Koha created an authority record from that and dropped the $ecreator it would
be wrong.

Making that work for 700, where $a$e means the relationship between the $a and
the work the bib record describes, but $a$e$t means the relationship between
the $a and the $t, would require a rewrite of how Koha decides what subfields
are appropriate, to make them dependent on the existence of others, and that
horrible ambiguity is probably why LC decided that it wasn't a good idea so
they wouldn't use it.

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