---
title: "prag-feats-features-selection — 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/selection.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**

This page as HTML: <https://groupants.elamur.ai/free/en/mova/prag/src/feats.rs.groupant/features.groupant/selection.groupant/>

# prag-feats-features-selection

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:** Filter quotation as speech, concatenate utterance and retain narrator frame. (bytes 7897–9266)
- **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/selection.groupant`](https://github.com/ElamurAI/mova-free/tree/main/prag/src/feats.rs.groupant/features.groupant/selection.groupant)
- **repository commit:** `48f2e6f74146`

> **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-selection-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `prag-feats-features-selection-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `prag-feats-features-selection-coupling` | constraint_relation | partial source model | [coupling](#coupling) |
| `prag-feats-features-selection-observation-fiber` | information_loss | partial source model | [observation-fiber](#observation-fiber) |

## Model text


Filter quotation as speech, concatenate utterance and retain narrator frame.

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

Initial frame speech cue admits all candidate spans. Otherwise admit carried span at byte zero, at least four whitespace words, no preceding alphanumeric, or !/? ending. Join trimmed retained contents with spaces; if none retain entire text and empty frame. quote is cont if carried, else none/whole/framed according to retained spans and alphabetic frame.

### behavior-complement

Universe: well-formed ordered byte spans of item text and carry flag to (utterance,frame,quote). Excludes selecting an interior one-word title without speech cue, and quote=whole when retained spans leave alphabetic narrator text. quote=cont has priority even with no retained span.

### reverse-reconstruction

For selected utterance/frame retain compatible delimiter spellings and whitespace variants inside span edges; joining multiple spans loses individual boundaries. quote=none admits unquoted texts and rejected short quotations.

### invariant

frame_of requires ordered nonoverlapping valid UTF-8 bounds; public quote_spans provides them. This private function does not validate arbitrary supplied intervals.

### cost

Text/frame scans and string copies O(B) plus narrator cue matching; candidate whitespace scans total O(B) on nonoverlapping spans. No measured speedup or executable approximation error bound is claimed.

### coupling

Speech detection uses initial candidate frame; final sayv later uses frame after filtering. These frames may differ; retain both in the state model.

### observation-fiber

Trim and join discard boundary whitespace and number of quotation spans. The speech heuristic does not distinguish every title from direct speech.

### composition

Speech detection uses initial candidate frame; final sayv later uses frame after filtering. These frames may differ; retain both in the state model. No child fragments; this is one scoped relation.

### checks

supplied_ud_projection_and_quote_selection supplies framed speech, rejected Book title, whole Hello and carried utterance with exact closure input assertions. 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.