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

The groupant beside prag/src/feats.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:** [`prag/src/feats.rs`](https://github.com/ElamurAI/mova-free/blob/main/prag/src/feats.rs)
- **source SHA-256:** `2a1a0bd6e43dd16f…`
- **covers:** Project supplied words, terminal punctuation, UD relations, cues and metadata into 32 coordinates. (bytes 9266–16029)
- **part of:** [prag-feats-features](https://md.groupants.elamur.ai/free/en/mova/prag/src/feats.rs.groupant/features.groupant/)
- **repository folder:** [`prag/src/feats.rs.groupant/features.groupant/projection.groupant`](https://github.com/ElamurAI/mova-free/tree/main/prag/src/feats.rs.groupant/features.groupant/projection.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 | [composition](#composition) |
| **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 |
|---|---|---|---|
| `prag-feats-features-projection-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `prag-feats-features-projection-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `prag-feats-features-projection-coupling` | constraint_relation | partial source model | [coupling](#coupling) |
| `prag-feats-features-projection-observation-fiber` | information_loss | partial source model | [observation-fiber](#observation-fiber) |

## Model text


Project supplied words, terminal punctuation, UD relations, cues and metadata into 32 coordinates.

Source snapshot: 2a1a0bd6e43dd16f7284e993f30d0f4971c447c9e2080616033d19ac8693611f. All relations concern this snapshot on the stated admissible domain. Models are source-derived partial relations; finite fixtures are evidence, not general proofs. Complement is a conservative inner constraint model. Reverse reconstruction preserves all compatible antecedents conceptually; no enumerating solver is implemented.

### forward

Content omits PUNCT and wholly nonalphanumeric forms. Terminal punctuation priority is ? then ! then ellipsis then period then dash then comma-like. Root is first head=0; subjects and tense auxiliaries are direct children. Inversion requires AUX before selected subject. Cue evaluation distinguishes pos/neg/mix; first prioritized act-like class becomes cue. ppos is only/first/last/mid; genre maps source.

### behavior-complement

Universe: finite Word vectors and valid text/frame/meta to 32-string rows. Excludes len outside six bucket labels, qm=no when a question mark occurs (value is yes or -), unknown source genre, neg=root when only a non-root/non-child negative exists, and terminal ! when terminal tail contains ?.

### reverse-reconstruction

A row retains all Word vectors with equal observed first/last/content bucket and selected root/child/cue facts. Length bucket 4-6 admits three content counts; punctuation tokens can vary without changing content slots. Unknown sperson '-' permits absent morphology even for you.

### invariant

First root and first qualifying child win; rootless input uses missing root slots. Head values are compared as indices, not validated as a tree. No semantic truth or correct parsing is inferred.

### cost

Constant-many linear word scans plus cue matching O(W*P*L); constant 32-slot output plus copied words and frame. No measured speedup or executable approximation error bound is claimed.

### coupling

Word forms determine normalization and lexical cues; UPOS/tag/feats/head/rel independently affect grammar slots. A token form alone cannot imply person morphology. ppos assumes sensible positions; extreme inconsistent public metadata remains outside tested domain.

### observation-fiber

Bucket and booleans collapse counts; first-hit wh/modal/subject discard later alternatives. qm scans entire utterance while end scans only final nonalphanumeric tail, so internal ? and terminal . can coexist.

### composition

Word forms determine normalization and lexical cues; UPOS/tag/feats/head/rel independently affect grammar slots. A token form alone cannot imply person morphology. ppos assumes sensible positions; extreme inconsistent public metadata remains outside tested domain. No child fragments; this is one scoped relation.

### checks

bucket_boundaries_and_terminal_priority checks twelve bucket boundaries and seven terminal strings; supplied UD checks eighteen named feature coordinates and empty-row test checks every slot. See the file-level evidence.md for exact log hashes and repeated run outcomes.

### epoch-memory

2026-10-30 wave13: initial source-bound model. Prospective model preceded edits. Existing normalization and quote rules were retained; tests expose their information loss. Source identity witness justified qualifying predecessor keys by Src. Annotation is isolated behind a private closure used by the production row wrapper; fixtures do not call or certify tokenizer/parser. AST is a partial syntax projection, macro bodies opaque; semantic AST, live model/corpus and general proof remain absent.