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

The groupant beside world/src/babi.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:** [`world/src/babi.rs`](https://github.com/ElamurAI/mova-free/blob/main/world/src/babi.rs)
- **source SHA-256:** `54596da093fa9515…`
- **covers:** set_me lowercases once and refuses a distinct established name. rename rewrites selected person keys/participants. move_to writes At and appends history; take removes previous carrier entry then appends; drop_ removes holder only on matching owner. Equations: H'[o]=a, C'[previous]=C[previous] without o, C'[a]=C'[a]++[o]; drop only removes H[o] when H[o]=a. move appends (order,t,p) and coalesces equal adjacent ohist places. (bytes 10950–13748)
- **part of:** [world-babi](https://md.groupants.elamur.ai/free/en/mova/world/src/babi.rs.groupant/)
- **repository folder:** [`world/src/babi.rs.groupant/inventory.groupant`](https://github.com/ElamurAI/mova-free/tree/main/world/src/babi.rs.groupant/inventory.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** | bounded checks partial scope | [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) |
| `identity_casefold` | identity_casefold | partial source derived model | [identity_casefold](#identity-casefold) |
| `owner_guard` | owner_guard | partial source derived model | [owner_guard](#owner-guard) |
| `location_history` | location_history | partial source derived model | [location_history](#location-history) |
| `rename_scope` | rename_scope | partial source derived model | [rename_scope](#rename-scope) |

## Model text


### descriptant

#### world-babi-inventory

set_me lowercases once and refuses a distinct established name. rename rewrites selected person keys/participants. move_to writes At and appends history; take removes previous carrier entry then appends; drop_ removes holder only on matching owner. Equations: H'[o]=a, C'[previous]=C[previous] without o, C'[a]=C'[a]++[o]; drop only removes H[o] when H[o]=a. move appends (order,t,p) and coalesces equal adjacent ohist places.

##### Modeling epoch — 2026-10-31

Read full assigned source before editing; prospective predictions retained in external wave29 receipts. This child binds only its stated half-open UTF-8 byte range; other APIs remain parent scope. Evidence is limited to named bounded fixtures; registration is partial modeling. Production behavior unchanged; only inline synthetic tests added to four assigned sources.

### approximant

#### Forward relation

set_me lowercases once and refuses a distinct established name. rename rewrites selected person keys/participants. move_to writes At and appends history; take removes previous carrier entry then appends; drop_ removes holder only on matching owner. Equations: H'[o]=a, C'[previous]=C[previous] without o, C'[a]=C'[a]++[o]; drop only removes H[o] when H[o]=a. move appends (order,t,p) and coalesces equal adjacent ohist places.

##### Domain and resource limits

Finite valid structures and allocation-success executions under the branch conditions in models.md; integer overflow is outside measured fixtures. Exact categorical relations have no supplied percent surrogate. Macro expansion, arbitrary model quality and external effects are not inferred from syntax.

### invariant

## Invariant

Within coherent maps, one holder per object; adjacent identical object places coalesce while person history repeats.

### Cost

Map updates O(log V), carry filtering O(C); rename traverses selected maps/vectors and may overwrite existing target keys.

### composition

#### Composition

This scope contributes inventory to its parent. Its forward, complement and preimage are restricted to the bound byte interval. The parent syntax projection is referenced once through ../syntax.json; no independent semantic AST is claimed.

### models

### behavior_complement

Exclude changing me to a distinct name or removing another owner's holder. Do not claim rename touches relation triples, object keys or all place names.

### reverse_reconstruction

Empty carry admits no-object, dropped and transferred-away histories. holder[o]=b admits any history ending with effective take(b,o) and no later effective drop. Overwritten locations are unrecoverable. Formally Pre(H*)={h | dom(final_holder(h))=dom(H*) and ∀o∈dom(H*), last_surviving_take(h,o)=H*[o]}. Thus every absent target key is absent in the final holder map; for H*=empty all earlier acquisitions must have been effectively dropped. Arbitrary overwritten intermediate transfers remain compatible.

### identity_casefold

NORA and nora have same identity; empty name accepted.

### owner_guard

drop_(a,o) with holder[o]=b keeps b but still filters/creates carry[a].

### location_history

Two moves to hall append two person entries but one adjacent object entry.

### rename_scope

Only pos/hist/carry/isa keys, holder values, give endpoints, attribute subjects and last_subj are traversed.

### tests

#### Bounded checks

Named checks associated with this source (not every fragment branch):

- babi::wave29_tests::identity_and_inventory_without_parser
- babi::wave29_tests::graph_and_sentence_boundaries_without_parser

17 unique named tests in total passed twice debug and twice release; sorted named outcomes equal across all four runs. Four compiled controls cover bAbI identity, StepGame tie ordering, parser-command state removal and bench-command CPU selection; each exits101 at a runtime assertion, exact source restored then positive exit0. Other sources have finite adversarial fixtures but no separately compiled mutant.

CLI integration coverage is command construction and temporary cleanup only; legacy school/model/cadence paths are not executed. No speed benchmark, GPU, live teacher, datasets or held-out replay.

Limits:

- Partial syntax projection only; no macro expansion or proof
- No useful percentage surrogate for exact categorical/state/effect semantics; executable approximant unsupported
- No live parser, corpus, gap journal, training or held-out evaluation
- Unicode recasing byte slices, unbounded recursion/overflow not covered

External receipt root: $MOVA_DATA/runs/octopus-wave29-worldeval-2026-10-31.