# Glossary Every Field 3.0 term defined in one place. - **Field 3.0** — atlaso's append-only, dispersion-aware knowledge model. - **Deposit** — one immutable record of an observation. - **Polarity** — direction of a claim: `positive` / `negative` / `cautionary` / `open`. The first three are directional and feed conflict detection. - **Evidence grade** — `anecdotal` / `observed` / `replicated` / `verified`. Weighed against scope breadth at the gate. - **Scope** — six optional facets (`model`, `dataset`, `env`, `version`, `n`, `seed`) plus a free-form `note`. The grouping key for conflict. - **Scope bag** — the set of deposits sharing the same six scope facets. - **Gate** — the write-time policy that decides whether a deposit may enter the store, based on `polarity × scope_breadth × evidence_grade`. - **Scope breadth** — *narrow* when ≥2 scope facets are non-null; *broad* otherwise. - **Provenance** — at least one `artifact_refs` entry OR a scoped `env` / `version`. Required for narrow-negative and cautionary deposits. - **Conflict** — a scope bag containing ≥2 distinct directional polarities (any pair from `{positive, negative, cautionary}`). - **is_confident** — bag-level verdict; true iff `bag_precision >= 0.99` AND not `is_single_sample` AND no `has_conflict`. - **agreement_score** — public alias for `bag_precision`. - **FMI (Field Maturity Index)** — geometric mean of Coverage × Precision × Resolution × Density, scaled 0–100. - **Coverage / Precision / Resolution / Density** — the four FMI pillars. - **Idempotency key** — per-item dedup key required by `add_many()`; `idempotency_key(*parts)` helper returns a content-addressed `ak_…` hash with a 24-hour window. - **Soft retract** — adds an `atlaso:retracted=` tombstone; preserves the audit chain. - **Hard delete** — irreversible; reserved for GDPR / PII erasure. - **UserHandle** — frozen per-user view returned by `Memory.for_user(...)`. --- **Source:** **Edit on GitHub:** **Updated:** 2026-05-12