# UxmlUnsignedLongAttributeDescription()

> Constructor.

## Definition

* **Type:** Constructor
* **Namespace:** [UnityEngine.UIElements](/engine/6000.5/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

> **Warning:**
>
> **Deprecated.** UxmlTraits system is deprecated and will be removed. Use UxmlElementAttribute instead.

```csharp
public UxmlUnsignedLongAttributeDescription()
```