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

The groupant beside onto/src/core.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:** [`onto/src/core.rs`](https://github.com/ElamurAI/mova-free/blob/main/onto/src/core.rs)
- **source SHA-256:** `467680ae687e0fa2…`
- **covers:** Known(v)→Some(&v),true,true; Unknown(reason)→None,false,true; NotApplicable→None,false,false. (bytes 5772–6111)
- **part of:** [onto-core](https://md.groupants.elamur.ai/free/en/mova/onto/src/core.rs.groupant/)
- **repository folder:** [`onto/src/core.rs.groupant/field.groupant`](https://github.com/ElamurAI/mova-free/tree/main/onto/src/core.rs.groupant/field.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 | `model.md` |
| **tests** | executed bounded checks | [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) |
| `empty_known` | empty_known | partial source derived model | [empty_known](#empty-known) |
| `reason_loss` | reason_loss | partial source derived model | [reason_loss](#reason-loss) |
| `borrow_transport` | borrow_transport | partial source derived model | [borrow_transport](#borrow-transport) |
| `state_space` | state_space | partial source derived model | [state_space](#state-space) |

## Model text


### descriptant

#### onto-core-field

Known(v)→Some(&v),true,true; Unknown(reason)→None,false,true; NotApplicable→None,false,false.

##### Epoch 2026-10-31

Prospective review preceded inline test edits. Tests used bounded synthetic CPU fixtures only. Scope bytes [5772,6111) in the parent source. No field gives known=true and applicable=false; Unknown cannot return Some.

No production optimization, live teacher, corpus, assessment or database mutation. Registry presence denotes partial modeling; syntax is lexical and generated twice identically.

### approximant

#### Forward model: onto-core-field

Known(v)→Some(&v),true,true; Unknown(reason)→None,false,true; NotApplicable→None,false,false.

##### Domain

Finite input arrays/text with resource availability and the source-specific bounds and representation assumptions in [invariant.md](https://md.groupants.elamur.ai/free/en/mova/onto/src/core.rs.groupant/field.groupant/#invariant). Exact categorical semantics; no executable percent surrogate is supplied. 1/2/5/10% caps need a meaningful metric and are not claimed.

##### Relations

known(Known(v))=Some(&v); known(Unknown(_))=known(NotApplicable)=None. is_known(f)⇔∃v:f=Known(v). is_applicable(f)⇔f≠NotApplicable. Thus is_known⇒is_applicable, but converse fails.

### invariant

## Invariant and cost

Scope bytes [5772,6111) in the parent source. No field gives known=true and applicable=false; Unknown cannot return Some.

### Cost

O(1), no allocation.

No allocation, integer-overflow, malformed public-state or external-effect guarantee beyond explicitly described branches.

### composition

#### Composition

Scope output feeds its parent: Generated CORE joins Graph by OEWN key/POS; check uses Kb::prop layer0 and ancestors. Query/describe can prefer core, but unknown values and lexfile warnings remain distinct.

Child fragments specialize concrete byte scopes and share the parent syntax projection; they do not duplicate whole-file guarantees. No composition-wide approximation error budget is established.

### models

## Typed obernant catalog

Partial source-derived relations, not proofs. Complement excludes incompatible observations; reverse describes compatible antecedents.

### behavior_complement

No field gives known=true and applicable=false; Unknown cannot return Some.

### reverse_reconstruction

None admits Unknown(any reason) and NotApplicable; pair(false,true) restricts Unknown but leaves reason free.

### empty_known

Known empty slices remain known and applicable; emptiness not ignorance.

### reason_loss

is_known/is_applicable discard Unknown reason without mutating it.

### borrow_transport

known borrows original T, no cloning or allocation.

### state_space

Three categorical states; no percentage surrogate metric.

### tests

#### Evidence, 2026-10-31

Selected command: cargo test --offline --locked -p onto --bin onto -- --exact --test-threads=1 core::wave29::field_and_synset_semantics

Named outcomes:

- core::wave29::field_and_synset_semantics

Two debug and two release/optimized executions returned zero and identical sorted nonempty named outcomes. Source-generated syntax pairs matched byte-for-byte. 1 compiled source mutation rejected by named test, exact source restored and positive rerun succeeded.

- Control: "!matches!(self, Field::NotApplicable) -> matches!(self, Field::Known(_))" → "core::wave29::field_and_synset_semantics" (exit 101).

Finite synthetic examples only. Full ingestion, live workers, real corpus, allocation/I/O fault injection, GPU and full-school behavior remain unexecuted. No universal or executable-approximant assurance. External receipts: octopus-wave29-ontocore-2026-10-31 (native-commands.json, source-test-map.json, outcomes.json, controls.json and numeric exit/log files).