# OpcClassicOrganization Enum

<span class="api-meta">since v2.18</span>

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.classic">Opc.UaFx.Classic</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
</dl>

Defines the type of namespace organization to use while browsing the address space.

## Syntax

<div class="api-signature" data-lang="csharp">

```csharp
public enum OpcClassicOrganization
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Enum OpcClassicOrganization
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → [ValueType](https://learn.microsoft.com/dotnet/api/system.valuetype) → [Enum](https://learn.microsoft.com/dotnet/api/system.enum) → **OpcClassicOrganization**

## Fields

| Name | Value | Description |
|---|---|---|
| <a id="flat"></a>`Flat` | `1` | The type of namespace organization is to be treated as a flatten layer of nodes while browsing the address space. |
| <a id="hierarchical"></a>`Hierarchical` | `2` | The type of namespace organization is to be treated as a hierarchy of nodes while browsing the address space. |
| <a id="query"></a>`Query` | `0` | The type of namespace organization to use / respect while browsing the nodes is to be queried from the server. According to the information provided by the server either [Flat](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.classic.opcclassicorganization/#flat) or [Hierarchical](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.classic.opcclassicorganization/#hierarchical) is used to discover the address space. |

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.18–v2.59 |