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

# prag-frames-read

The groupant beside prag/src/frames.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/frames.rs`](https://github.com/ElamurAI/mova-free/blob/main/prag/src/frames.rs)
- **source SHA-256:** `b5047edab2caec4e…`
- **covers:** Sentence assembly and context snapshot (bytes 171503–176620)
- **part of:** [prag-frames](https://md.groupants.elamur.ai/free/en/mova/prag/src/frames.rs.groupant/)
- **repository folder:** [`prag/src/frames.rs.groupant/read.groupant`](https://github.com/ElamurAI/mova-free/tree/main/prag/src/frames.rs.groupant/read.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** | bounded native and inspected | `../model.md#evidence` |

## 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-frames-read-behavior-complement` | behavior_complement | partial source model | [behavior-complement](#behavior-complement) |
| `prag-frames-read-reverse-reconstruction` | reverse_reconstruction | partial source model | [reverse-reconstruction](#reverse-reconstruction) |
| `prag-frames-read-snapshot-loss` | history_fiber | partial source model | [snapshot-loss](#snapshot-loss) |

## Model text


Subject: prag/src/frames.rs SHA-256 bfbc2f7905d878080a7e7dd30ae7f1bfe8f07313c3a4cf8f0254be29e72a4b88. Partial source model, finite native evidence. Fixed configuration and admitted finite resource domains; source-derived inner exclusions and ambiguous preimages, no inverse solver.

### forward

read_with snapshots up to eight positive-salience entities, builds units and repairs, appends frames at base b, offsets links/asked and joins consecutive roots if permitted. next-events removes links involving non-event or conditional frames; configured rules apply last.

### behavior-complement

Universe: fixed default configuration and supplied event-only sentence fixtures. Exclude missing offset next edge between two distinct unquoted roots with no earlier next, changing before snapshot to post-read entities, or adding output for an empty parse.

### reverse-reconstruction

before loses entities after the top eight and all zero-salience entries; text/output admits callback implementations returning identical supplied words. Sentence order can be visible through next but exact original typography is unrecoverable.

### invariant

Mutating ctx during reading must not retroactively alter before. Local links are offset once. Active rules can subsequently change output; fixed rule state is a premise.

### cost

Sum sentence extraction costs plus O(frames+links) offset/remap, context sorting O(E log E), and unbounded callback/rule work.

### snapshot-loss

Two contexts with identical first eight salient entity records and different lower-ranked entities produce equal before snapshots. That equality does not imply equal future pronoun resolution.

### composition

Tests execute tiny in-memory parse closures, no live parser or environment mutation. Resource defaults may be read by production helpers; effectful callbacks and nonempty active rules are not validated.

### epoch-memory

Wave15, 2026-10-30. Prospective repair: reject unresolved right heads in identity with a constant six-item guard, preserving coordination membership and its nontransitivity. Old production failed unresolved_identity_is_symmetric_even_in_coordination; repaired code passes. Compiled guard-removal control fails the same named assertion and exact bytes are restored. Eight focused tests pass twice debug and twice release. No speed, full semantic coverage or universal proof claim.

### limitations

Partial syntax is not expanded semantic AST. No live parser, teacher, whole corpus, GPU or environment mutation. Acyclic input trees and fixed configuration/resource premises matter; malformed recursive ancestry, counter overflow, complete TAM/lexicon/quotation/repair semantics and all active-rule effects remain open. No executable approximant/error budget is claimed.