> For the complete documentation index, see [llms.txt](https://india-energy-stack.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://india-energy-stack.gitbook.io/docs/schemas/schemas-ies.md).

# All Schemas

> One page per schema family: the current field reference, the canonical file URLs, and every published version. Use the search box (top) to find a schema or field across all of them.

## Verifiable Credentials

W3C VC payloads — signed, durable records the holder keeps and verifies independently of any network.

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>ElectricityCredential</strong></td><td>v1.2</td><td>A W3C Verifiable Credential, issued per meter or connection by a distribution licensee, that carries the static facts of a consumer's connection and the energy resources behind the meter.</td><td><a href="/pages/6bstCNXx0uxKZpIoUj2i">/pages/6bstCNXx0uxKZpIoUj2i</a></td></tr><tr><td><strong>MeterDataCredential</strong></td><td>v0.6</td><td>A signed, tamper-evident wrapper that attests who delivered a set of smart-meter readings, and that the readings have not been altered since.</td><td><a href="/pages/v1POKuDxfbO89mq6G59k">/pages/v1POKuDxfbO89mq6G59k</a></td></tr><tr><td><strong>MeterDataRequestCredential</strong></td><td>v0.6</td><td>A W3C Verifiable Credential a data requester attaches to a Beckn request to prove it is authorised to ask for smart-meter telemetry.</td><td><a href="/pages/9fK3ruTxQlTKq2vNRWrM">/pages/9fK3ruTxQlTKq2vNRWrM</a></td></tr></tbody></table>

## Data Exchange payloads

Structured, non-credential payloads exchanged over the network or published as feeds.

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>MeterData</strong></td><td>v0.6</td><td>A lightweight, high-throughput telemetry payload for exchanging smart-meter readings, events and alarms — cheap to parse and store at Head-End-System scale, without cryptographic wrapping.</td><td><a href="/pages/y0ZuhvtvDzd107imiohW">/pages/y0ZuhvtvDzd107imiohW</a></td></tr><tr><td><strong>MeterDataRequest</strong></td><td>v0.6</td><td>The query, capability and authorisation shapes a party uses to ask for smart-meter telemetry — not the telemetry itself.</td><td><a href="/pages/SavuRRYdNHvk9tMqCVlb">/pages/SavuRRYdNHvk9tMqCVlb</a></td></tr><tr><td><strong>ArrFiling</strong></td><td>v0.5</td><td>A structured, machine-readable version of the Aggregate Revenue Requirement (ARR) filing a distribution licensee submits to its state electricity regulator.</td><td><a href="/pages/xPup7c8HzUgHb3rQcAlG">/pages/xPup7c8HzUgHb3rQcAlG</a></td></tr><tr><td><strong>OutageNotification</strong></td><td>v0.1</td><td>A machine-readable payload a distribution licensee publishes to describe one planned or unplanned electricity outage — usable both as a public outage-map feed and as a push alert to affected consumers.</td><td><a href="/pages/hpQDxWVfcMskdgJboXF4">/pages/hpQDxWVfcMskdgJboXF4</a></td></tr></tbody></table>

## External — DEG schemas IES uses

Schemas defined and published outside this repository, canonical at [schema.nfh.global](https://schema.nfh.global). Their field reference is mirrored in [External Schemas](/docs/schemas/external.md).

***

## How versions work

Every schema lives at `schemas/<Family>/v<version>/` with its own `attributes.yaml` (source of truth), compiled `schema.json`, `context.jsonld`, `vocab.jsonld`, `examples/` and a generated `README.md` field reference. A **non-breaking** change (additive, optional fields, new enum values) is absorbed by the same minor version; a **breaking** change (rename, removal, type or semantics change) is published in a new sibling version, never overwriting the old one. Old versions stay reachable — see **Versions** on each page.

To propose a new schema or a change, see the [proposal flow](https://github.com/India-Energy-Stack/ies-accelerator/blob/main/schemas/README.md#proposing-a-new-schema-or-a-change).


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