> ## Documentation Index > Fetch the complete documentation index at: https://docs.cognite.com/llms.txt > Use this file to discover all available pages before exploring further. # Process industries data model > Explore Cognite's process industries data model that extends the core data model for process industry requirements. Cognite's process industries data model—**CogniteProcessIndustries**—extends the [core data model](/cdf/dm/dm_reference/dm_core_data_model) to cater to specific requirements for the process industries. It's available from the **`cdf_idm`** [system space](/cdf/dm/dm_concepts/dm_system_schemas). ## Process industries concepts The extended process industries concepts come with matching [**containers**](/cdf/dm/dm_concepts/dm_containers_views_datamodels#containers) and [**views**](/cdf/dm/dm_concepts/dm_containers_views_datamodels#views). ### CogniteMaintenanceOrder The CogniteMaintenanceOrder concept has properties to represent **maintenance orders**. A maintenance order is a request or directive to perform maintenance tasks such as repair, inspection, or servicing of equipment or assets. It's often called a 'work order'. | Property | Type | Description | | ---------- | -------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | | mainAsset | Direct relation to [CogniteAsset](/cdf/dm/dm_reference/dm_core_data_model#asset) | The primary asset (functional location) the maintenance order refers to. | | type | String | The code for the type of maintenance order, for example, 'PM01' for 'Corrective maintenance'. | | status | String | The lifecycle status of the maintenance order, for example, 'Partially complete'. It's often derived from the 'SystemStatus' field in SAP. | | priority | Int64 | A number that shows how important this maintenance order is. Lower numbers mean it's more important, and 0 means it's the most important. | | operations | Reverse direct relation list | Lists the individual work items on the maintenance order. An automatically populated list of operations related to the maintenance order. | The following core features and concepts are also available for this concept: [CogniteDescribable](/cdf/dm/dm_reference/dm_core_data_model#describable-props), [CogniteSourceable](/cdf/dm/dm_reference/dm_core_data_model#sourceable-props), [CogniteSchedulable](/cdf/dm/dm_reference/dm_core_data_model#scheduleable-props), [CogniteActivity](/cdf/dm/dm_reference/dm_core_data_model#activity) ### CogniteOperation The CogniteOperation concept has properties to represent **operations**, a specific part of the work included in a maintenance order. Often called a "work order item". | Property | Type | Description | | ---------------------- | -------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | | maintenanceOrder | Direct relation to [CogniteMaintenanceOrder](#cognitemaintenanceorder) | The maintenance order the operation is related to. | | mainAsset | Direct relation to [CogniteAsset](/cdf/dm/dm_reference/dm_core_data_model#asset) | The primary asset (functional location) the operation is related to. | | phase | String | The code for the phase the operation belongs to. Each operation belongs to a single phase, for example, 'Scaffolding'. | | status | String | The lifecycle status of the operation, for example, 'Partially complete'. It's often derived from the `UserStatus` field in SAP. | | sequence | Int64 | A number that shows the order in which the operations are performed. Lower numbers mean they happen earlier, and 0 means it's the first operation. | | mainDiscipline | String | The primary skill or resource required to perform the operation, for example, "maintenance technician". | | numberOfMainDiscipline | Int64 | The number of resources required to perform the operation, for example, the number of required maintenance technicians. | | personHours | Float64 | The number of hours required to perform the maintenance operation. The duration is calculated by dividing the `personHours` by the `numberOfMainDiscipline`. | The following core features and concepts are also available for this concept: [CogniteDescribable](/cdf/dm/dm_reference/dm_core_data_model#describable-props), [CogniteSourceable](/cdf/dm/dm_reference/dm_core_data_model#sourceable-props), [CogniteSchedulable](/cdf/dm/dm_reference/dm_core_data_model#scheduleable-props), [CogniteActivity](/cdf/dm/dm_reference/dm_core_data_model#activity) ### CogniteNotification The CogniteNotification concept has properties to represent maintenance **notifications**. Notifications are formal records to report maintenance issues, defects, or requests, starting the process for planning and running maintenance activities. | Property | Type | Description | | ------------------- | -------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------- | | maintenanceOrder | Direct relation to [CogniteMaintenanceOrder](#cognitemaintenanceorder) | The maintenance order that was created from the notification. | | asset | Direct relation to [CogniteAsset](/cdf/dm/dm_reference/dm_core_data_model#asset) | The asset (functional location) the notification is related to. | | type | String | The code for the notification type, for example, "M1" for "Maintenance request". | | status | String | The current lifecycle status of the notification, for example, "order created". | | priority | Int64 | A number that shows how important the notification is. Lower numbers mean it's more important, and 0 means it's the most important. | | priorityDescription | String | Describes the priority of the notification. | The following core features and concepts are also available for this concept: [CogniteDescribable](/cdf/dm/dm_reference/dm_core_data_model#describable-props), [CogniteSourceable](/cdf/dm/dm_reference/dm_core_data_model#sourceable-props), [CogniteSchedulable](/cdf/dm/dm_reference/dm_core_data_model#scheduleable-props)