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Specification

ModDef is defined by a versioned, normative specification. The Protobuf schema is canonical; the spec prose describes the semantics, validation rules, and conformance requirements every implementation follows.

  • v0.5 (current): the current draft. Adds embedded (same-word) mantissa/exponent composed values (§14.2) — the Iskra T5/T6 / Eaton PXM "decade exponent in the value word" pattern.

The spec is maintained in the moddef repository under spec/, alongside the schema (proto/), the conformance fixtures (fixtures/), and architecture decision records (spec/adr/).

Looking for a gentler introduction? Start with the Guide.