# ObjectClassGroupDecl

Location: [gRPC API](https://developer.m-files.com/APIs/gRPC-API/index.md) > [Reference](https://developer.m-files.com/APIs/gRPC-API/Reference/index.md) > [Messages](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/index.md)

HTML version: https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.ObjectClassGroupDecl/

Object class for declarative configuration.

- **Full name:** `MFiles.ObjectClassGroupDecl`
- **Proto file:** [`mfiles/structs.proto`](https://developer.m-files.com/APIs/gRPC-API/downloads/proto/mfiles/structs.proto)

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## Fields

| Field | Type | Number | Description |
|---|---|---|---|
| <a id="f-base_info"></a>`base_info` | [`ValueListItemDecl`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.ValueListItemDecl/index.md) | 1 | Value list item representing this element. |
| <a id="f-object_class_group"></a>`object_class_group` | [`ClassGroup`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.ClassGroup/index.md) | 2 | Other information on the class group. |
| <a id="f-aliases"></a>`aliases` | `string` | 3 | Semicolon-separated list of semantic aliases. |
| <a id="f-acl"></a>`acl` | [`AccessControlList`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.AccessControlList/index.md) | 4 | Specifies the ACL that defines the visibility and other permission settings of this class. Also specifies who can attach objects to this class. |
| <a id="f-unknown_json"></a>`unknown_json` | `string` | 5 | Opaque JSON object of schema-recognized, converter-unmapped properties for this element, keyed by original property name. |

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## Used in fields

- [`DeclarativeMetadataStructure.class_groups`](https://developer.m-files.com/APIs/gRPC-API/Reference/Messages/MFiles.DeclarativeMetadataStructure/index.md#f-class_groups): An array of the ObjectClassGroupDecl structures.