> For the complete documentation index, see [llms.txt](https://navixy.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://navixy.com/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/system.md).

# System catalogs

Predefined system catalog items available to all workspaces. These read-only reference types cannot be modified or deleted.

System-defined catalog items that cannot be modified by users.

## Objects

### Module

A system module that groups related functionality. Examples: repo (core), fleet\_management (FSM), iot (devices), reports, billing.

**Implements:** [CatalogItem](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitem), [Node](/docs/navixy-graphql-api/core-api-reference/common.md#node), [Versioned](/docs/navixy-graphql-api/core-api-reference/common.md#versioned), [Titled](/docs/navixy-graphql-api/core-api-reference/common.md#titled)

| Field       | Type                                                                                                                                   | Description                                                                                                                                    |
| ----------- | -------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| `id`        | `ID!`                                                                                                                                  | A globally unique identifier.                                                                                                                  |
| `version`   | `Int!`                                                                                                                                 | The version number for optimistic locking.                                                                                                     |
| `title`     | `String!`                                                                                                                              | The human-readable display name. Can be localized.                                                                                             |
| `code`      | [Code](/docs/navixy-graphql-api/core-api-reference/common.md#code)!                                                                    | A machine-readable code, unique within the catalog for a given workspace. A workspace item may reuse the code of the system item it overrides. |
| `order`     | `Int!`                                                                                                                                 | The display order within the same level or category.                                                                                           |
| `catalog`   | [Catalog](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalog)!                 | The catalog this item belongs to.                                                                                                              |
| `workspace` | [Workspace](/docs/navixy-graphql-api/products/business-data-repository/api-reference/workspaces.md#workspace)                          | The workspace that owns this item. Null for system items.                                                                                      |
| `meta`      | [CatalogItemMeta](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitemmeta)! | Metadata about this item including description, origin, and display properties.                                                                |

***

### EntityType

A definition of an entity type in the system.

**Implements:** [CatalogItem](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitem), [Node](/docs/navixy-graphql-api/core-api-reference/common.md#node), [Versioned](/docs/navixy-graphql-api/core-api-reference/common.md#versioned), [Titled](/docs/navixy-graphql-api/core-api-reference/common.md#titled)

| Field                    | Type                                                                                                                                          | Description                                                                                                                                    |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| `id`                     | `ID!`                                                                                                                                         | A globally unique identifier.                                                                                                                  |
| `version`                | `Int!`                                                                                                                                        | The version number for optimistic locking.                                                                                                     |
| `title`                  | `String!`                                                                                                                                     | The human-readable display name. Can be localized.                                                                                             |
| `code`                   | [Code](/docs/navixy-graphql-api/core-api-reference/common.md#code)!                                                                           | A machine-readable code, unique within the catalog for a given workspace. A workspace item may reuse the code of the system item it overrides. |
| `order`                  | `Int!`                                                                                                                                        | The display order within the same level or category.                                                                                           |
| `catalog`                | [Catalog](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalog)!                        | The catalog this item belongs to.                                                                                                              |
| `workspace`              | [Workspace](/docs/navixy-graphql-api/products/business-data-repository/api-reference/workspaces.md#workspace)                                 | The workspace that owns this item. Null for system items.                                                                                      |
| `meta`                   | [CatalogItemMeta](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitemmeta)!        | Metadata about this item including description, origin, and display properties.                                                                |
| `uuidDiscriminator`      | `String!`                                                                                                                                     | The 4-character code embedded in UUIDs for entities of this type.                                                                              |
| `isCustomizable`         | `Boolean!`                                                                                                                                    | Whether entities of this type support custom fields.                                                                                           |
| `customFieldDefinitions` | \[[CustomFieldDefinition](/docs/navixy-graphql-api/products/business-data-repository/api-reference/custom-fields.md#customfielddefinition)!]! | Custom field definitions for entities of this type, ordered by display order.                                                                  |

***

### Country

A country reference data item.

**Implements:** [CatalogItem](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitem), [Node](/docs/navixy-graphql-api/core-api-reference/common.md#node), [Versioned](/docs/navixy-graphql-api/core-api-reference/common.md#versioned), [Titled](/docs/navixy-graphql-api/core-api-reference/common.md#titled)

| Field        | Type                                                                                                                                   | Description                                                                                                                                    |
| ------------ | -------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| `id`         | `ID!`                                                                                                                                  | A globally unique identifier.                                                                                                                  |
| `version`    | `Int!`                                                                                                                                 | The version number for optimistic locking.                                                                                                     |
| `title`      | `String!`                                                                                                                              | The human-readable display name. Can be localized.                                                                                             |
| `code`       | [Code](/docs/navixy-graphql-api/core-api-reference/common.md#code)!                                                                    | A machine-readable code, unique within the catalog for a given workspace. A workspace item may reuse the code of the system item it overrides. |
| `order`      | `Int!`                                                                                                                                 | The display order within the same level or category.                                                                                           |
| `catalog`    | [Catalog](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalog)!                 | The catalog this item belongs to.                                                                                                              |
| `workspace`  | [Workspace](/docs/navixy-graphql-api/products/business-data-repository/api-reference/workspaces.md#workspace)                          | The workspace that owns this item. Null for system items.                                                                                      |
| `meta`       | [CatalogItemMeta](/docs/navixy-graphql-api/products/business-data-repository/api-reference/catalogs/catalog-items.md#catalogitemmeta)! | Metadata about this item including description, origin, and display properties.                                                                |
| `alpha2Code` | [CountryCode](/docs/navixy-graphql-api/core-api-reference/common.md#countrycode)!                                                      | The [ISO 3166](https://www.iso.org/standard/3166.html)-1 alpha-2 country code.                                                                 |

***

## See also

* [Pagination](/docs/navixy-graphql-api/pagination.md)
* [Filtering and sorting](/docs/navixy-graphql-api/filtering-and-sorting.md)
* [Error handling](/docs/navixy-graphql-api/error-handling.md)
* [Optimistic locking](/docs/navixy-graphql-api/optimistic-locking.md)
* [Limits](/docs/navixy-graphql-api/limits.md)


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