# INxDerivedField Interface

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

## Syntax

```
[ValueClass]
public interface INxDerivedField : IAbstractStructure
```

## Properties

| Name | Description |
| --- | --- |
| [Expr](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxDerivedField.Expr.htm#Qlik_Engine_INxDerivedField_Expr) | Expression of the derived field.<br><br>Example:<br><br>If `qName` is `OrderDate.MyDefinition.Year` , the expression is as follows:<br><br><br>`=${Mydefinition(OrderDate).Year}`<br><br>JSON property name: qExpr |
| [Id](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxDerivedField.Id.htm#Qlik_Engine_INxDerivedField_Id) | Identifier of the derived field.<br><br>The identifier is unique.<br><br>JSON property name: qId |
| [Method](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxDerivedField.Method.htm#Qlik_Engine_INxDerivedField_Method) | Method name associated to the derived field.<br><br>JSON property name: qMethod |
| [Name](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxDerivedField.Name.htm#Qlik_Engine_INxDerivedField_Name) | Combination of field name, definition and method.<br><br>Example:<br><br><br>`OrderDate.MyDefinition.Year`<br><br>JSON property name: qName |
| [Tags](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxDerivedField.Tags.htm#Qlik_Engine_INxDerivedField_Tags) | List of tags.<br><br>JSON property name: qTags |