[vtkusers] vtkExtractSelection documentation error?

[David Doria]

The documentation says:

"The subset is described by the contents of the vtkSelection on its
first input port. The dataset is given on its second input port."

When I do this (following the documentation):
extractSelection->SetInput(0, selection);
extractSelection->SetInput(1, pointSource->GetOutput());

it segfaults.

When I reverse them, it works fine:

extractSelection->SetInput(0, pointSource->GetOutput());
extractSelection->SetInput(1, selection);

Should these be reversed in the documentation? Or am I
misunderstanding "ports vs connections" or something like that?

Thanks,

David