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

The groupant beside tools/treebanks/src/refs.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:** [`tools/treebanks/src/refs.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/treebanks/src/refs.rs)
- **source SHA-256:** `4cba047b00b79595…`
- **covers:** identifier-grammar (bytes 2988–3640)
- **part of:** [treebanks-refs](https://md.groupants.elamur.ai/free/en/mova/tools/treebanks/src/refs.rs.groupant/)
- **repository folder:** [`tools/treebanks/src/refs.rs.groupant/identifier-grammar.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/treebanks/src/refs.rs.groupant/identifier-grammar.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 | `model.md` |
| **ast** | partial | `../syntax.json` |
| **composition** | partial | [Composition](#composition) |
| **cost** | partial | [invariant-and-cost](#invariant-and-cost) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant-and-cost](#invariant-and-cost) |
| **tests** | 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) |
| `old_width` | old_width | partial source derived model | [old_width](#old-width) |
| `venue_boundary` | venue_boundary | partial source derived model | [venue_boundary](#venue-boundary) |
| `year_syntax` | year_syntax | partial source derived model | [year_syntax](#year-syntax) |
| `record_separation` | record_separation | partial source derived model | [record_separation](#record-separation) |

## Model text


### descriptant

#### Descriptant

Accept old exactly eight bytes uppercase letter/two digits/hyphen/four digits, or new three dot fields with four-digit year, lowercase alphanumeric interior-hyphen venue, and nonempty numeric suffix.

##### Epoch 2026-10-31

Prospective source reading identified conditional input alignment, information loss and failure order before tests. Existing production code is retained; added tests use actual helpers. Finite results update this source-bound model, not all parser/corpus semantics.

No executable percentage surrogate has a justified observation metric for these categorical/effectful APIs. Future profiles require metric, domain and real-reference evidence at caps 1/2/5/10%; no higher cap. Syntax is partial lexical Rust projection without macro expansion or semantic resolution.

### approximant

## Forward approximant

Accept old exactly eight bytes uppercase letter/two digits/hyphen/four digits, or new three dot fields with four-digit year, lowercase alphanumeric interior-hyphen venue, and nonempty numeric suffix.

### Composition

This fragment is the exact byte-scoped helper identified in the manifest; its relation is restricted to the operations above.

The containing source wires this scoped relation to its callers. Treeagree proposal→gate→commit and treebanks parse→match→collect→render are actual joins; parsecmp is an independent diagnostic path. The external group model distinguishes these tags.

### catalog

## Typed models for treebanks-refs-identifier-grammar

Subject: source SHA-256 `478c68b66f1dd86a691861bb26d634ffce9dd47aef7572e437a7fa1cc6e95db5`; manifest supplies exact source/byte scope. Domain: admitted states in forward model, nonoverflow arithmetic and successful allocations. Observation: one terminating invocation, except explicitly described file trace. Source-derived partial relations; named finite tests constrain selected cases only. Each entry holds arguments and environment fixed except its stated intervention.

### behavior_complement

Lowercase old prefix and new middle field without hyphen are rejected; valid syntax does not imply record existence.

Operator: inner exclusion on admitted domain. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### reverse_reconstruction

Boolean true has infinitely many syntactic new suffix strings; the predicate retains no canonical identifier or known-record membership.

Operator: compatible antecedent relation, retaining ambiguity. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### old_width

W17-0401 accepted while W17-040 and w17-0401 fail exact byte shape.

Operator: specialized observation relation under the stated fixed inputs. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### venue_boundary

Leading/trailing venue hyphens reject but internal repeated hyphens are allowed by grammar.

Operator: specialized observation relation under the stated fixed inputs. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### year_syntax

New year is four ASCII digits without chronological range check, so 0000 is syntactically possible.

Operator: specialized observation relation under the stated fixed inputs. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### record_separation

Matcher distinguishes accepted unknown ids from indexed hits; grammar acceptance alone supplies no paper.

Operator: specialized observation relation under the stated fixed inputs. Evidence: source branch derivation plus tests.md; unexercised branches remain hypotheses. Oracle: evaluate the scoped actual helper on admissible fixtures and compare this observation. No universal proof.

### tests

#### Scoped evidence

Parent native slice and exact names are in `../tests.md`.

Only named finite assertions cover selected inputs; other branches and invalid-domain behavior remain source-derived.

This fragment has no independent full-coverage claim. Its byte range and source hash bind the source-derived relation; parent test success is evidence only where that helper is actually reached.

### invariant-and-cost

#### Invariant and cost

O(id bytes), split vector allocation for new form; no network lookup.

Lowercase old prefix and new middle field without hyphen are rejected; valid syntax does not imply record existence.

The complement and specialized catalog constrain preserved coordinates and effect boundaries. Empty/malformed domains are only guaranteed where explicitly admitted. No whole-program cost bound follows from a helper bound.