@gwiedeman This is a great reading, thank you! I have a question: If I understand correctly, and I've never used Blacklight/Arclight so I'm not sure, are you using a parent-child model for Solr documents **https://github.com/UAlbanyArchives/description_indexer/blob/main/description_indexer/models/arclight.py **?

Would the ancestor-descendant path field type be a good fit too for this design https://library.brown.edu/create/digitaltechnologies/searching-for-hierarchical-data-in-solr/ ?

@gwiedeman Lately, I have been involved in publishing some archival fonds to a simplified library discovery tool (proprietary). I chose to use an ancestor-descendant field to model the tree, but without attaching metadata to collections/folders.
Here they are: **https://tecadigitaleacs.cultura.gov.it/media/esplora** **https://tecadigitaleacs.cultura.gov.it/media/inventory**
Your article is so good at identifying the issues; I will also write something about it.