...
From Basecamp: local authorities managed in an IZ can only be used in records that are not linked to the NZ. If local authorities are needed for any records linked to the NZ those authorities must also live in the NZ.
Alma allows multiple subject authorities to be used but only one name authority, regardless of whether they are managed in NZ or IZ. The result is that any local name authorities have to be added to the “regular” name authority file (ex. LCNAMES) and will show up in Alma authority search results with “(Local)” in parentheses but will appear in bibs as though they are regular NAF records
From Phase 3:
“Local authority record conversion is not part of the migration scope of Alma. If you have locally created or modified authority records to load into your local institution, use the standard Alma loader tools post-migration. In a consortial setup, they likely reside in the Network Zone for sharing across members. Contact your local Ex Libris project team for consultation if this is relevant for your institution. ”So Ex Libris says local authority records go last - do we disagree for any reason?
...
Should they live in an IZ or in the NZ?
See above, authorities that are needed for NZ-linked bibs should live in an IZ
Do local decisions about certain LCSH terms have any bearing on this (Illegal Aliens, for example)?
...