### Author:  [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)
#### Post date: [October 6, 2025, 9:01am UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/1 "2025-10-06T09:01:08Z")
Hello,
My ParaView plugin works fine for a C++ class `MyClass`. However, when I put the class in a namespace `mynamescape`, ParaView does not recognize it, leading to a crash with the well-known message “_This typically means that ParaView does not know about the request class to create an instance of if. Ensure that it has been correctly wrapped using the client-server wrappers and the wrapping has been initialized. Note class names are case-sensitive._”
Can I somehow specify the name of the namespace containing the class in the ServerManagerConfiguration? It would make sense to me to have something like this:
```auto
```
Where can I find the documentation for the ParaView plugin XML file? I would like to know what fields are supported in ProxyGroup, the allowed types, etc.
Thank you
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 6, 2025, 9:38am UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/2 "2025-10-06T09:38:01Z")
Well, what is a namespace ? I don’t think this concept exists for proxies.
---
### Author:  [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)
#### Post date: [October 6, 2025, 9:44am UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/3 "2025-10-06T09:44:45Z")
It was just an example how I would imagine supporting a namespace in the XML file.
> I don’t think this concept exists for proxies.
If I cannot use a namespace in the PV plugin wrapping, I can live with it. The problem is that I don’t know the supported keywords and values in the XML file.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 6, 2025, 11:40am UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/4 "2025-10-06T11:40:27Z")
But what is a namespace here ? What are you trying to do ?
---
### Author:  [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)
#### Post date: [October 6, 2025, 12:29pm UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/5 "2025-10-06T12:29:06Z")
Originally, I had
```cpp
class MyClass : public vtkPNGReader {
...
}
```
with the XML file
```xml
...
```
which works in ParaView. As my code is becoming more and more complex, I restructured it into namespaces.
```cpp
namespace mynamespace {
class MyClass : public vtkPNGReader {
...
}
}
```
I can build the plugin, but when I use it, I get the error written in my first post. How should I modify the XML file so that it recognizes `MyClass`?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 6, 2025, 12:57pm UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/6 "2025-10-06T12:57:51Z")
Got it, this is not supported.
---
### Author:  [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)
#### Post date: [October 6, 2025, 1:02pm UTC](https://discourse.paraview.org/t/how-to-specify-a-namespace-for-sourceproxy-in-the-xml-file/17230/7 "2025-10-06T13:02:20Z")
OK, thank you.