# Subject Folder

> A facility that separates two sets of one concern under a container, present if and only if the sets must not merge.

Record: `lex:subject-folder`
Kind: mechanism
Layer: [Structural Core](https://banes-lab.com/records/layer/structural-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-subject-folder

## category

- [Taxonomy / Classification / Naming](https://banes-lab.com/records/lex-category/taxonomy-classification-naming.md)

## referenced-by

- [Sideways Overflow](https://banes-lab.com/records/arch/sideways-overflow.md)
- [Member Never Restates the Set](https://banes-lab.com/records/arch/member-never-restates-the-set.md)