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lang: en
title: 'API docs: repository.modeldefinitionsyntax'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.modeldefinitionsyntax.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [ModelDefinitionSyntax](./repository.modeldefinitionsyntax.md)
## ModelDefinitionSyntax interface
DSL for building a model definition.
**Signature:**
```typescript
export interface ModelDefinitionSyntax
```
## Properties
| Property | Modifiers | Type | Description |
| --- | --- | --- | --- |
| [jsonSchema?](./repository.modeldefinitionsyntax.jsonschema.md) | | [JsonSchemaWithExtensions](./repository.jsonschemawithextensions.md) | _(Optional)_ |
| [name](./repository.modeldefinitionsyntax.name.md) | | string | |
| [properties?](./repository.modeldefinitionsyntax.properties.md) | | { \[name: string\]: [PropertyDefinition](./repository.propertydefinition.md) \| [PropertyType](./repository.propertytype.md)<!-- -->; } | _(Optional)_ |
| [relations?](./repository.modeldefinitionsyntax.relations.md) | | [RelationDefinitionMap](./repository.relationdefinitionmap.md) | _(Optional)_ |
| [settings?](./repository.modeldefinitionsyntax.settings.md) | | [ModelSettings](./repository.modelsettings.md) | _(Optional)_ |