E.20:4.3 - Step 3: Resolve the designator before dependent use
When a change introduces MechanismDefinitionRef, create one resolvable target at the subject-pattern locus before another declaration cites it. Distinguish two target states:
- Reference-reservation stub. This is a draft authoring episteme, not
U.Mechanism. It reserves the designator, names the intended operation-family EntityOfConcern, cites the subject pattern, and lists the missing A.6.1 identity or content needed for introduction. A publication may expose the stub as a candidate. A suite may cite it only in an explicitly candidate-valued position; the stub cannot satisfy admitted suite membership, closure, planned-baseline, wiring, gate, reuse, or import claims. - Introduced mechanism episteme.
MechanismDefinitionRefresolves to one A.6.1U.Mechanismepisteme with recoverable identity and sufficient content for the receiving use. Only this state can fill a position whose ValueKind isU.Mechanism.
A card, table row, file, or register entry may publish either state. Its layout and publication identity do not determine which state obtains.