---
title: "world-school-actors-world-answer-priority — Mova code model"
description: "Mova code model of world/src/school.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/school.rs.groupant/actors-world.groupant/answer-priority.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# world-school-actors-world-answer-priority

The groupant beside world/src/school.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

## Facts

- **kind:** groupant_fragment
- **status:** partial source bound model
- **source:** [`world/src/school.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/school.rs)
- **source SHA-256:** `06aaec6f562c2acc…`
- **covers:** Ordered return chain: front+back; front direction; inclusive span; clock wrap; minutes; unknown start/change; full/remainder packing; rate; remaining share; spent; share; last group; named subset; comparisons; named holder plus shift; all; isolated question number; first original holder/event subject. A selected branch may return None and shadows later candidates. (bytes 58468–61333)
- **part of:** [world-school-actors-world](https://md.groupants.elamur.ai/free/en/mova/world/src/school.rs.groupant/actors-world.groupant/)
- **repository folder:** [`world/src/school.rs.groupant/actors-world.groupant/answer-priority.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/school.rs.groupant/actors-world.groupant/answer-priority.groupant)
- **repository commit:** `855da7bd4a7b`

> **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

## Components

| component | label | where |
|---|---|---|
| **approximant** | partial source model | [forward](#forward) |
| **ast** | partial | `../../syntax.json` |
| **composition** | partial source model | [composition](#composition) |
| **cost** | partial source model | [cost](#cost) |
| **descriptant** | partial source model | [epoch-memory](#epoch-memory) |
| **invariant** | partial source model | [invariant](#invariant) |
| **tests** | partial source model | [checks](#checks) |

## Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

| id | type | label | where |
|---|---|---|---|
| `world-school-actors-world-answer-priority-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `world-school-actors-world-answer-priority-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `world-school-actors-world-answer-priority-shadowed_none` | failure_order | partial source model | [shadowed_none](#shadowed-none) |
| `world-school-actors-world-answer-priority-ordered_quantity` | constraint_relation | partial source model | [ordered_quantity](#ordered-quantity) |
| `world-school-actors-world-answer-priority-world_readonly` | effect_boundary | partial source model | [world_readonly](#world-readonly) |
| `world-school-actors-world-answer-priority-schema_ambiguity` | information_loss | partial source model | [schema_ambiguity](#schema-ambiguity) |

## Model text


Wave34, 2026-10-31. Source-bound helper model; no universal proof or approximation-error certificate. Historical parent epoch remains intact.

### forward

Ordered return chain: front+back; front direction; inclusive span; clock wrap; minutes; unknown start/change; full/remainder packing; rate; remaining share; spent; share; last group; named subset; comparisons; named holder plus shift; all; isolated question number; first original holder/event subject. A selected branch may return None and shadows later candidates.

### invariant

Answer schemas observe supplied fields/world only. Missing prerequisite inside a selected branch is not permission to try later branches. Arithmetic requires representability, valid divisors and abs not overflowing; this is not a general arithmetic validator.

### cost

Most branches O(1) plus map lookup; spent scans J events, selected-holder sum scans S lookups, total scans A actors. Worst O(J+S log A+A); no persistent mutation.

### composition

play must succeed before solve calls answer_of, even for field-only schemas. This node models priority within answer_of separately. Parent focus can filter holdings/events while retaining schema flags, which affects this precedence.

### behavior-complement

Exclude span fallback when front/ask_behind selects a missing line; exclude ask_all fallback when nonempty ask_some contains a missing actor. Exclude last-group results when an earlier valid share schema is present. These are absence constraints over supplied Reading/world/result triples.

### reverse-reconstruction

For observed result z, union the compatible fibers of each first-selected schema, requiring all earlier selection guards false (or not applicable). Later fields are unconstrained. None includes missing lookup and invalid exact-share fibers at the selected stage; it does not identify which schema failed.

### shadowed_none

Front+ask_behind returns line.map(n-front); line=None ends evaluation even with a valid span. Nonempty ask_some sums Options and returns None for one missing key before ask_whose/all.

### ordered_quantity

front+back computes f+b-1 ahead of ask_front; inclusive span computes e-s+1 ahead of clock/minutes; packing full precedes remainder when both flags hold.

### world_readonly

Output evaluation borrows Reading and BTreeMap immutably; answer alone cannot learn verbs, update weights or persist state.

### schema_ambiguity

The integer 6 can arise from line, rate, group or holder branches. Observing only the number loses branch identity and all shadowed fields; even None conflates distinct missing prerequisites.

### checks

Exact world library selections: school::wave34_models::answer_priority_preserves_shadowed_absence. Current repeated debug/release outcomes and compiled controls are in the root sidecar wave34-evidence.md. Only these supplied-input tests are current evidence; older parent module-wide receipts are historical. Macro bodies remain opaque.

### epoch-memory

Prospective model saved before edits. This epoch deepens one existing node rather than renaming it. Production implementation unchanged; tests add helper-boundary observations where stated. No live lessons, frozen suites, model loading, teacher or network. Read-only symbolic relations are broader than the finite native domain.