openits-models

The OpenITS data-model layer, extracted from the Vikasa monorepo as a standalone, importable Go module. This repo owns the vendor-neutral model definitions and the code generated from them; downstream components (e.g. openits-collector) consume it as a dependency.

Module path: github.com/Vikasa2M/openits-models

Layout

Path	Contents
yang/	YANG source modules (the source of truth for the model).
api/proto/	Protobuf sources: hand-authored command.proto/device.proto plus generated openits/v1/*.proto (event payloads + shared types), produced from yang/ by the in-repo YANG→proto generator (tools/yang-proto-gen).
pkg/proto/openits/v1/	Generated Go protobuf types (package openitspb).
pkg/yang/openits/	Generated ygot Go types (package openits).
schema-registry/	AsyncAPI/JSON-schema registry entries per service.
bindings/nats/	NATS reference profile: subject grammar, CloudEvents envelope, JetStream notes (README.md) and the generated asyncapi.yaml (see note below). The transport-neutral model layer above does not depend on it.
scripts/, tools/	Model generation, validation, and lint tooling.
docs/	Design rationale — how the model is shaped and why.

Design & rationale

The model's shape is deliberate, and much of it is a direct application of OpenConfig's lessons: many small, independently-versioned modules rather than a mega-module per device; leaning into the telemetry side that OpenConfig got right; and avoiding the one-size-fits-all configuration side that fractured. See:

• docs/data-model.md — the module family, event taxonomy, wire provenance, and a "Lessons applied" summary.
• docs/04-design-decisions.md — why each choice was made (YANG contract, per-event proto, greenfield vs. bridged, …).
• docs/05-standards-alignment.md — NTCIP / J2735 / ARC-IT mapping.
• docs/06-extension-model.md — augments, deviations, and graduation.
• docs/08-capability-architecture.md — model by function; thin device profiles compose capability modules.
• docs/07-conformance.md, docs/glossary.md, docs/reference/yang-reference-conventions.md.

Using it

go get github.com/Vikasa2M/openits-models@latest

import (
    openitspb "github.com/Vikasa2M/openits-models/pkg/proto/openits/v1"
    openits   "github.com/Vikasa2M/openits-models/pkg/yang/openits"
)

Non-Go implementers should start from the curated release bundle instead (yang/, api/proto/, schema-registry/, bindings/ — attached to each GitHub release).

Regeneration

make gen             # yang -> proto (tools/yang-proto-gen) -> pkg/proto (protoc); yang -> pkg/yang (ygot)
make check-gen       # gen, then fail if output drifts from what's committed (freshness gate)
make yang-proto-gen  # yang -> api/proto/openits/v1/*.proto (event payloads + shared types) + field-numbers.yaml lock
make proto           # api/proto -> pkg/proto (protoc)
make yang            # yang -> pkg/yang (ygot fakeroot structs)
make validate-yang check-revisions check-naming
make validate-noi check-graduation check-augment-collisions

command.proto/device.proto under api/proto/ are hand-curated and untouched by make yang-proto-gen.

Requires protoc/buf, ygot/goyang, and (optionally) pyang and yanglint.

bindings/nats/asyncapi.yaml is carried here as a published artifact of the NATS reference profile, regenerated in-repo from the YANG-derived ce-type catalog by make asyncapi. See bindings/nats/README.md for the profile spec and docs/07-conformance.md for the two-tier (model vs. NATS-profile) conformance model.

Provenance

openits-models is self-contained: the YANG modules are the source of truth, and every other artifact (protobuf, Go, JSON Schema, AsyncAPI, schema-registry snapshots) is generated from them by in-repo tooling. No other repository is required to build, generate, or validate this repo. The collector and other consumers depend on this module; this module depends on none of them.

Contributing, versioning & releases

• CONTRIBUTING.md — the edit-YANG-then-regenerate workflow and the full set of gates CI enforces.
• docs/versioning.md — how the Go module version, per-module YANG revisions, and protobuf wire compatibility relate, plus the step-by-step release process.
• CHANGELOG.md — notable changes per release.

CI (.github/workflows/ci.yml) runs the full gate on every push and PR: generation freshness, go build/vet/test, buf lint + breaking-change detection, YANG governance checks, yanglint instance-data validation, and the conformance harness across all device kinds.

License

Licensed under the Apache License 2.0. See NOTICE for attribution, including the vendored IETF YANG modules under yang/ietf/.