# INxListObjectExpressionDef Interface

Namespace: [Qlik.Engine](https://help.qlik.com/en-US/sense-developer/November2024/Subsystems/NetSDKAPIref/Content/Qlik.Engine.htm)  
Assembly: Qlik.Engine.dll

## Syntax

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

## Properties

| Name | Description |
| --- | --- |
| [Expr](https://help.qlik.com/en-US/sense-developer/November2024/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxListObjectExpressionDef.Expr.htm#Qlik_Engine_INxListObjectExpressionDef_Expr) | Value of the expression.<br><br>JSON property name: qExpr |
| [LibraryId](https://help.qlik.com/en-US/sense-developer/November2024/Subsystems/NetSDKAPIref/Content/Qlik.Engine.INxListObjectExpressionDef.LibraryId.htm#Qlik_Engine_INxListObjectExpressionDef_LibraryId) | Refers to an expression stored in the library.<br><br>JSON property name: qLibraryId |