# Bnf Property

## Overloads

| [Bnf](https://help.qlik.com/en-US/sense-developer/November2025/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBNFDef.Bnf.htm#Qlik_Engine_IBNFDef_Bnf) |  | Array of token references that all together build up the definition of the current token.<br><br>Generally, if the array is not empty, the definition is a BNF rule (`qIsBnfRule` is set to true). However, some BNF rules do have an empty array (`qIsBnfRule` is set to true, but `qBnf` is empty).<br><br>JSON property name: qBnf |
| --- | --- | --- |

[](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBNFDef.Bnf.htm) [](https://help.qlik.com/en-US/sense-developer/Subsystems/NetSDKAPIref/Content/Qlik.Engine.IBNFDef.Bnf.htm)

## Bnf

Array of token references that all together build up the definition of the current token.

Generally, if the array is not empty, the definition is a BNF rule (`qIsBnfRule` is set to true). However, some BNF rules do have an empty array (`qIsBnfRule` is set to true, but `qBnf` is empty).

JSON property name: qBnf

### Declaration

```

          IEnumerable<int> Bnf { get; set; }
    
  
```

### Property Value

| Type | Description |
| --- | --- |
| System.Collections.Generic.IEnumerable&lt;System.Int32&gt; |  |