# ModelSchemaAttributeCheckCallback

typedef

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-engine/src/model/schema.ts#L2133)

#### Parameters

* `context: ModelSchemaContext`
* `attributeName: string`

#### Returns

* `boolean | undefined`

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Full index of the CKEditor 5 API reference: [llms.txt](llms.txt)