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

The groupant beside world/src/family.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/family.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/family.rs)
- **source SHA-256:** `1adc6d432b9de7ea…`
- **covers:** idea_key = last segment after ': ' of prefix before ' IF '. change_line encodes add/remove or replace TAB=>TAB. change_scope general iff second column exactly general; change_of unknown nonreplace kind becomes Remove after rule parse. (bytes 63083–64425)
- **part of:** [world-family](https://md.groupants.elamur.ai/free/en/mova/world/src/family.rs.groupant/)
- **repository folder:** [`world/src/family.rs.groupant/pool-codec.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/family.rs.groupant/pool-codec.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 | [approximant](#approximant) |
| **ast** | partial | `../syntax.json` |
| **composition** | partial | [composition](#composition) |
| **cost** | partial | [cost](#cost) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | partial bounded parent tests | [tests](#tests) |

## 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 |
|---|---|---|---|
| `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `world_family_pool_codec_invariants` | world_family_pool_codec_invariants | partial source derived model | [world_family_pool_codec_invariants](#world-family-pool-codec-invariants) |
| `world_family_pool_codec_resource_cost` | world_family_pool_codec_resource_cost | partial source derived model | [world_family_pool_codec_resource_cost](#world-family-pool-codec-resource-cost) |
| `world_family_pool_codec_representation_join` | world_family_pool_codec_representation_join | partial source derived model | [world_family_pool_codec_representation_join](#world-family-pool-codec-representation-join) |
| `world_family_pool_codec_domain_partition` | world_family_pool_codec_domain_partition | partial source derived model | [world_family_pool_codec_domain_partition](#world-family-pool-codec-domain-partition) |

## Model text


### descriptant

#### world-family-pool-codec

idea_key = last segment after ': ' of prefix before ' IF '. change_line encodes add/remove or replace TAB=>TAB. change_scope general iff second column exactly general; change_of unknown nonreplace kind becomes Remove after rule parse.

##### Modeling epoch 2026-10-31

Prospective source/branch/cost hypotheses were saved externally before source edits. This partial source-derived model retains observed boundaries rather than claiming complete verification. No live channel, exploration, pool/negative-file persistence or state transition evidence; no surrogate.

### approximant

#### Forward relation

idea_key = last segment after ': ' of prefix before ' IF '. change_line encodes add/remove or replace TAB=>TAB. change_scope general iff second column exactly general; change_of unknown nonreplace kind becomes Remove after rule parse.

Domain: UTF-8 and clean TSV fields; arbitrary injected delimiters not roundtrip-safe.

No executable percent surrogate: these categorical/effect observations lack a useful approximation metric. Future supported caps1/2/5/10% need a defined domain/metric and real reference evidence; no error or speed bound is claimed.

### invariant

Generated clean machine lines roundtrip given retained scope. Reversed label direction yields distinct key; semantic feature validation absent.

Cost component: [cost.md](https://md.groupants.elamur.ai/free/en/mova/world/src/family.rs.groupant/pool-codec.groupant/#cost).

### cost

Linear line/atom parsing and string allocation; no pool disk access in codec.

### composition

explore grouping uses these lossy pair keys to exclude variants and prioritize at most3 independent pairs.

### models

### behavior_complement

Malformed replace without separator cannot yield Change. Unknown opcode with valid rule is accepted as Remove. Colon without following space in obl:agent stays in key.

### reverse_reconstruction

Same key admits many operation prefixes/IF conditions; Remove admits unknown opcode spellings. Scope is lost in Change, so inverse requires explicit scope parameter.

### world_family_pool_codec_invariants

Generated clean machine lines roundtrip given retained scope. Reversed label direction yields distinct key; semantic feature validation absent.

### world_family_pool_codec_resource_cost

Linear line/atom parsing and string allocation; no pool disk access in codec.

### world_family_pool_codec_representation_join

explore grouping uses these lossy pair keys to exclude variants and prioritize at most3 independent pairs.

### world_family_pool_codec_domain_partition

UTF-8 and clean TSV fields; arbitrary injected delimiters not roundtrip-safe.

### tests

#### Scoped evidence

Parent selected test names: ["family::wave29_worldlearn::scoped_change_preserves_position_and_domain", "family::wave29_worldlearn::split_fence_and_label_pair_direction"]. These finite tests touch only the named behaviors, not every statement in this fragment. See [parent evidence](https://md.groupants.elamur.ai/free/en/mova/world/src/family.rs.groupant/#tests). control-family: compiled source mutation failed with exit101; source restored byte-for-byte and15positive tests passed.

Scope bytes [63083,64425) are bound to the shared parent syntax projection and full source hash. No live channel, exploration, pool/negative-file persistence or state transition evidence; no surrogate.