# Historical data

<dl class="api-definition">
<dt>Concept</dt>
<dd><a href="/docs/development/opcua/client/historical-data">Historical data</a></dd>
</dl>

| Type | Description |
|---|---|
| [IOpcEventHistoryNavigator&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.iopceventhistorynavigator-1/) |  |
| [IOpcNodeHistoryNavigator&lt;T&gt;](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.iopcnodehistorynavigator-1/) |  |
| [OpcAggregateType](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcaggregatetype/) | Specifies an aggregate function of the OPC UA namespace, whose identifier [GetTypeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcaggregate/members#gettypeid) provides. |
| [OpcClient](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/) | Provides session based methods to access OPC UA server services. |
| [OpcEvent](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcevent/) | Represents a snapshot of a 'Opc.UaFx.OpcEventNode'. |
| [OpcEventFilter](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opceventfilter/) | Represents the filter of a monitored item for events, as defined by the EventFilter of OPC UA: the select clauses define the fields to report of each event and the where clause defines the events to report. |
| [OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/) | Represents a value of the history of a node. |
| [OpcModifiedHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcmodifiedhistoryvalue/) | Represents a value of the modified history of a node together with the information about its modification. |
| [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) | Defines an identifier for a node in the address space of an OPC UA Server. |
| [OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/) | Provides information about the outcome of an operation. |
| [OpcStatusCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatuscollection/) | Representes a collection of [OpcStatus](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcstatus/) instances. |
| [OpcValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcvalue/) | Stores a value optionally associated with status and timestamp information. |