Foundational Kind
These kinds exist because they carry materially different identity, lifecycle, agency, provenance, or structural semantics that should not be hidden inside arbitrary domain labels.
Specification-sourced: quoted from the governing specification, pending the applicable specification-owner approvals. The specification controls.
In plain words
The Model keeps the set deliberately small: Person, Organization, Community, LivingSystem, Place, Facility, Material, Instrument, DigitalAgent and Formation. Concepts such as farmer, buyer or grain lot extend these kinds through governed vocabulary rather than becoming new kinds in the kernel.
What it is not
Foundational Kind ≠ Identity
Foundational Kind says what fundamentally different kind of thing an entity is; Identity says which enduring thing it is. Identity, Kind, Domain Type, and Role · Subject Model (source: 02 §2.1)
Foundational Kind ≠ Domain Type
Foundational Kind is stable, while domain types specialize its meaning and can change without changing the kind. Foundational Kind Is Stable · Canonical Model & Protocol (source: 04 §6.3)