(Determine if we can) map FOLIO instance data to the MARC leader

[cbeer]

In Symphony, our MARC leaders were always populated with the format information (e.g. "This thing is a book"). In FOLIO, we're not mapping anything from the FOLIO instance metadata into the MARC leader, leading to some funny behavior where we expected there'd be required data (e.g. sul-dlss/SearchWorks#3970).

Is there data we can + should map into the MARC leader in MarcRecordInstanceMapper? https://folio-org.atlassian.net/wiki/spaces/FOLIOtips/pages/5673766/Default+MARC+Bibliographic-to-Inventory+Instance+Mappings indicates that FOLIO maps the MARC leader byte 7 information to FOLIO instance metadata.

1. Inventory what MARC leader data we're using in the indexer
2. Talk with Alissa et al about what/where/how to map data from the instance to FOLIO
3. Implement the mapping when we're constructing our own MARC records from FOLIO instance metadata.

[hudajkhan]

May also relate to #3970 (SearchWorks)

[taylor-steve]

In the indexer we are:

Building format_main_ssim from:

• leader/06, some cases considering 008/26 and 008/33
• leader/07 == 's' with 008/21 present
• leader/07 == 'i' with 008/21 present
• Specifically for LANE, given leader/06 is 'a' or 't' AND leader/07 is 'c' or 'd', remove 'Archive/Manuscript' and add 'Book'

Building genre_ssim:

• 'Conference proceedings' if Leader/07 = 'm' or 's' and 008/29 = '1'
• 'Technical report' looking at:
  • leader/06: a or t AND 008/24-27 (any position, i.e. 24, 25, 26, or 27): t OR
  • Presence of 027 OR 088 OR
  • 006/00: a or t AND 006/7-10 (any position, i.e. 7, 8, 9, or 10): t

[ahafele]

This is tricky given the slim Instance creation requirements. I could work on a mapping that would get you some ldr info some times, but the data won't always be in the instance record.

Here is the default Instance to MARC mapping that FOLIO's Data Export app uses - https://github.com/folio-org/mod-data-export/blob/master/src/main/resources/rules/rulesDefault.json. It only attempts to map 3 leader positions, none of which are those we are concerned with. The data requirements for instance creation are only Title and Resource Type.

LDR 06 could probably be mapped from the Resource Type, example Resource Type = cartographic image maps to ldr/06 e - Cartographic material

LDR 07 wouldn't be possible unless the Mode of Issuance field gets populated in the Instance record. Mapping would be fairly direct.

The above also doesn't address and 008 population or lack thereof.

More than happy to work on a mapping if it seems worth pursuing - let me know.

[taylor-steve]

The FOLIO code confirms the export rules you shared, very minimal: https://github.com/folio-org/generate-marc-utils/blob/38d217f5b25592d627492630a0636e1b2c7a25c7/src/main/java/org/folio/writer/impl/MarcRecordWriter.java#L33

If everything is a fairly direct mapping, I'd say let's give it a try @ahafele, unless @cbeer has different thoughts. Even getting things in generally the right "bucket" for those positions seems to have value?

[ahafele]

I took a quick pass at a simple ldr 06/07 mapping. If utilized, should be reviewed by Jeanette/Metadata first. https://docs.google.com/spreadsheets/d/1WoSe_9DSX5g5mTLuLumfpeIDeFVn_inH8s1gsnq_TU8/edit#gid=0

[taylor-steve]

Noting that Jeanette has suggested some refinements but would like to look into it further, early next week. I will update as soon as that happens.