---
title: "world-read-segmentation-heading — Mova code model"
description: "Mova code model of world/src/read.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/world/src/read.rs.groupant/segmentation.groupant/heading.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-read-segmentation-heading

The groupant beside world/src/read.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/read.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/read.rs)
- **source SHA-256:** `80ef1f69d776dcb5…`
- **covers:** Heading recognition (bytes 1217–1931)
- **part of:** [world-read-segmentation](https://md.groupants.elamur.ai/free/en/mova/world/src/read.rs.groupant/segmentation.groupant/)
- **repository folder:** [`world/src/read.rs.groupant/segmentation.groupant/heading.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/read.rs.groupant/segmentation.groupant/heading.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 | [parent-interaction](#parent-interaction) |
| **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-read-segmentation-heading-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `world-read-segmentation-heading-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `world-read-segmentation-heading-parent-interaction` | composition_relation | partial source model | [parent-interaction](#parent-interaction) |
| `world-read-segmentation-heading-boundary` | constraint_relation | partial source model | [boundary](#boundary) |
| `world-read-segmentation-heading-information` | information_projection | partial source model | [information](#information) |
| `world-read-segmentation-heading-cost` | resource_relation | partial source model | [cost](#cost) |

## Model text


Wave34, 2026-10-31. Subject: world-read-segmentation-heading, current source SHA 80ef1f69d776dcb5cd03bf925cc5c01e827d7919495ccda17d785eb3de459857. Domain: one terminating supplied-input helper transition; valid indices, sufficient memory and finite strings/trees/worlds. Source-derived partial relations, not a verified universal theorem. All views below share this domain and exact manifest scope; specialized assumptions are stated locally. No executable percentage approximant is claimed.

### forward

For line i, accept iff blank-before and either >=5 alphabetic characters all uppercase with trimmed byte length <70, or >=3 leading spaces, uppercase first character, <=10 whitespace words, no final . , ; :, >=5 alphabetic characters, and a following blank line.

### invariant

Accepted centered headings exclude two-space indentation and missing following blanks unless independently accepted by caps; a nonblank previous line excludes both routes.

### behavior-complement

Accepted centered headings exclude two-space indentation and missing following blanks unless independently accepted by caps; a nonblank previous line excludes both routes.

### reverse-reconstruction

Recover every line/context satisfying the observed Boolean. Accepted uppercase headings do not identify indentation, punctuation or title length below the cap; rejected headings retain all failed-predicate combinations.

### parent-interaction

Original indentation is tested before trimming; paragraph normalization cannot be moved ahead of recognition.

### boundary

Capital branch counts letters as Unicode characters but length as UTF-8 bytes; these are different thresholds.

### information

A line may satisfy both branches; there is one heading transition, not two stories.

### cost

Classification scans the line, allocates alphabetic characters and counts words: O(bytes) time and O(letters) temporary space.

### checks

Centered heading fixtures plus historical marker/whitespace tests; recognition is not literary-title detection.

Exact selected native boundary: `cargo test --offline --locked -p world --lib read::wave34_models::centered_heading_boundaries -- --exact --test-threads=1`. Repeated in debug and release; see the current file-level wave34 evidence and external native-receipts.json.

### assurance

The behavior-complement is an inner exclusion hypothesis over admissible input/output pairs, derived from branch order; not the complement of an incomplete model of the entire file. Reverse reconstruction is the compatible antecedent relation, retaining every modeled ambiguity rather than a chosen inverse. Parent-interaction is a composition relation, boundary a constraint relation, information an information/state projection, and cost a resource relation. The named checks are finite falsifiers; unexecuted branches remain source-inspected gaps. No parser/model/teacher/corpus/frozen assessment was run.

### epoch-memory

New child in wave34; no prior child renamed or counted. Parent historical wave8/wave9 evidence remains historical. Current raw receipts are in the external wave34 reasoning run; source syntax is partial, macros opaque, and no semantic AST or general proof is supplied.