Domain Pack
A Domain Pack is a governed, versioned package of semantic extensions for a coherent domain or cross-domain capability.
Specification-sourced: quoted from the governing specification, pending the applicable specification-owner approvals. The specification controls.
In plain words
Domain Packs let the Model grow without modifying Core when a new crop, instrument, observed property, predicate or validation rule is needed. A grain-quality term would arrive through an agriculture pack rather than through a change to the core grammar.