---
title: "school-question-label — Mova code model"
description: "Mova code model of world/src/knowledge.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/knowledge.rs.groupant/format.groupant/question.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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# school-question-label

The groupant beside world/src/knowledge.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/knowledge.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/knowledge.rs)
- **source SHA-256:** `0128bd416063db7a…`
- **covers:** Question separator and marked-answer decoding (bytes 3741–4663)
- **part of:** [school-format](https://md.groupants.elamur.ai/free/en/mova/world/src/knowledge.rs.groupant/format.groupant/)
- **repository folder:** [`world/src/knowledge.rs.groupant/format.groupant/question.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/knowledge.rs.groupant/format.groupant/question.groupant)
- **repository commit:** `48f2e6f74146`

> **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` |
| **cost** | partial source model | [cost](#cost) |
| **descriptant** | present | [epoch-memory](#epoch-memory) |
| **invariant** | partial source model | [invariant](#invariant) |
| **tests** | existing scoped checks | [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 |
|---|---|---|---|
| `school-question-label-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `school-question-label-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `school-question-label-marked-position` | label_projection | partial source model | [marked-position](#marked-position) |
| `school-question-label-delimiter-boundary` | grammar_boundary | partial source model | [delimiter-boundary](#delimiter-boundary) |

## Model text


Source-bound partial models, epoch 2026-10-29. Subject: world/src/knowledge.rs at the manifest SHA-256. Observation: Question separator and marked-answer decoding. Every relation below concerns this frozen source/configuration. Structural validation does not establish semantic correctness.

### forward

Split on literal space-pipe-space, trim parts, require at least question plus two options; choose sole starred option or default first; preserve remaining option order.

### invariant

Successful question output contains at least one wrong option; no uniqueness or nonempty string guarantee exists.

### cost

O(input bytes + output strings) for split/trim and copied options.

### checks

knowledge::tail_tests::the_starred_option_is_the_right_one. See ../../tests.md for executed scope. A proposed oracle below is not a completed check.

### epoch-memory

2026-10-29: inspected the existing implementation before modeling. Preserved current behavior, including lossy decoding, index-sensitive ties and conditional updates. Existing witness tests distinguish active-scope learning from a wrong global witness. Counts represent distinct observations, not independent proofs. No source changes, performance gain, full-course result or autonomous combiner is claimed. AST remains explicitly absent; ranges bind source bytes only. Parser resources, panic/allocation behavior and complete inference semantics remain gaps.

### behavior-complement

Type: behavior_complement. Domain and observation: Question separator and marked-answer decoding, as narrowed below. Operator/target: U is question(value,file) Result transitions; R is its delimiter/marker decoder. Inner-bound U\R excludes success with fewer than three split parts and success with two or more marked option positions. A star in the question position is not an answer marker.

Approximation: source-derived scoped relation, conditional on valid internal state and fixed flags/resources; unmodeled behavior remains unknown. Evidence/oracle: Existing two-star failure is a negative control; short-line cases are proposed.

### reverse-reconstruction

Type: reverse_reconstruction. Domain and observation: Question separator and marked-answer decoding, as narrowed below. Operator/target: For (q,r,wrongs), compatible encodings include unmarked r-first and every insertion position of starred r among ordered wrongs, with whitespace and repeated leading stars normalized. Restrict encodings so other wrong options do not start with star. Do not infer original answer position.

Approximation: source-derived scoped relation, conditional on valid internal state and fixed flags/resources; unmodeled behavior remains unknown. Evidence/oracle: Proposed exhaustive insertion-position oracle.

### marked-position

Type: label_projection. Domain and observation: Question separator and marked-answer decoding, as narrowed below. Operator/target: Let M={i>=1 | part_i starts with '*'}. |M|=0 selects part1 unchanged; |M|=1 selects trim(trim_start_matches('*',part_i)); |M|>1 errors. Wrong option order is the original index order with chosen index deleted.

Approximation: source-derived scoped relation, conditional on valid internal state and fixed flags/resources; unmodeled behavior remains unknown. Evidence/oracle: Existing test covers sole marker away from first and legacy fallback.

### delimiter-boundary

Type: grammar_boundary. Domain and observation: Question separator and marked-answer decoding, as narrowed below. Operator/target: Only literal ' | ' splits fields; bare pipe or tab-pipe-tab remains within a part before trimming. Empty trimmed answer strings and duplicate strings are admitted if cardinality/marker guards pass. Format validation therefore does not imply semantically distinct alternatives.

Approximation: source-derived scoped relation, conditional on valid internal state and fixed flags/resources; unmodeled behavior remains unknown. Evidence/oracle: Prospective separator/empty/duplicate fixture; no new executed claim.