# Extensible Schema

> A schema shaped so new fields can be added without breaking existing consumers.

Record: `lexicon:extensible-schema`
Kind: constraint
Layer: [Contracts Core](https://banes-lab.com/records/layer/contracts-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-extensible-schema

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Consistent Semantics](https://banes-lab.com/records/lexicon/consistent-semantics.md) and before [Protocol Contract](https://banes-lab.com/records/lexicon/protocol-contract.md).

## Category

- [Contracts / Interfaces / Compatibility](https://banes-lab.com/records/lexicon-category/contracts-interfaces-compatibility.md)

## Required by

- [Forward Compatibility](https://banes-lab.com/records/architecture/forward-compatibility.md)

## Linked from

- [Contracts / Interfaces / Compatibility](https://banes-lab.com/ontology/principles/architecture-category-contracts-interfaces-compatibility.md)