Elamur Groupantsqagen-schema-alphabet
The groupant beside qagen/src/schema.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
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 |
| ast | partial | ../syntax.json |
| composition | partial source model | composition |
| cost | partial source model | cost |
| descriptant | partial source model | epoch-memory |
| invariant | partial source model | invariant |
| tests | partial source model | 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 |
|---|---|---|---|
qagen-schema-alphabet-complement | behavior_complement | partial source model | behavior-complement |
qagen-schema-alphabet-reverse | reverse_reconstruction | partial source model | reverse-reconstruction |
qagen-schema-alphabet-projection | closed_alphabet_projection | partial source model | specialization |
Model text
forward
Normalize with trim and Unicode lowercase, then search literal seven QType or two ExIm names; Rule admits only byte 1 or 2. Domain: all supplied UTF-8 strings and u8 values; observation: Option enum, canonical name or numeric version. Exact scoped formula, not a performance surrogate.
invariant
ALL order is stable; canonical names are unique; parse(name(t))=Some(t); Rule::of(r.num())=Some(r).
behavior-complement
Noncanonical normalized spellings, internal whitespace changes, abbreviations and version bytes outside {1,2} cannot produce accepted values. Universe: supplied finite UTF-8 strings/Para sequences and candidate observable results. These are scoped source-derived exclusions, not merely negative test outcomes.
reverse-reconstruction
For accepted t, all s with lowercase(trim(s))=name(t) are compatible; rejected output collects every other string. Canonical name and version number uniquely recover their enum inside these closed alphabets. Operator is the set-valued fiber F^-1(y) = {x in domain | F(x)=y}; no implemented complete inverse solver or unique recovery claim.
specialization
Normalization quotient identifies case and surrounding whitespace but preserves internal spaces; round trips alone cannot catch a consistently renamed alphabet, hence independent literals.
cost
For input byte length B, normalization and lookup cost O(B) time and O(B) allocation; enum/name/version operations cost O(1). Fixed alphabet sizes seven and two.
composition
Schema version selects a fixed rules prefix; renderer appends batch-local paragraph and sentence coordinates. Context uses original document identity and paragraph number only for immediate-predecessor adjacency. Child scopes share source identity; inverses must share the same Rule and Para sequence rather than combining unrelated marginal fibers.
checks
Six new wave17_models tests (two schema, four prompt), including 256 rule bytes and 98 successor cases. See root evidence.md for compiled controls and repeated build-profile outcomes.
epoch-memory
2026-10-30 prospective review: unchecked predecessor addition could overflow; cross-document comparison already correct. A synthetic MAX to MIN witness panicked before repair. checked_add preserves ordinary adjacency and keeps context at the overflow boundary. Schema literal mapping had no witnessed defect. No API changes.
limitations
Partial source models, with literal and finite observations; no analytical approximation error or speed claim. Syntax projection is partial, macro bodies opaque. Input text is rendered verbatim, including delimiter-like content; grammar-injective recovery requires trusted delimiter-free fields. Teacher, parser, corpus, database and data acquisition were not executed.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/qagen/src/schema.rs.groupant/alphabet.groupant/