A.2.1:12 - SoTA-Echoing

Practice line	Source and status	FPF mutation	Practical consequence
Current foundational ontology distinguishes role-like classification, relation aspects, and explicit relation occurrences.	Almeida, Guizzardi, Sales, and Fonseca, gUFO, 2026 preprint; current comparator, not imported hierarchy.	Keep local system-role kinds, direct assignment species, SlotKinds, and performed Work distinct under FPF identity laws.	The same system can receive several assignments without becoming several systems.
Relation modeling distinguishes a family from concrete relation signatures with different participant laws.	Current A.6.0, A.6.5, and A.6.REL line.	Let directly declared species carry the exact participant and predicate law while the family provides the common ValueKind used by receivers.	A commission-sensitive appointment remains usable by F.6 without a duplicate generic relation.
DDD makes interpretation local to an actual model-use organization.	Evans, Domain-Driven Design Reference (2015) and current context-mapping practice.	Cite a selected `BoundedModelUseStructure` only in a receiving claim it changes, unless a separately admitted species truly requires it.	Ordinary physical and organizational assignments gain no fabricated context participant.