[dune-functions] Question about the VTKWriter

[Oliver Sander]

Hi guys,
I must have missed a detail.  At the end of poisson-pq2.cc it says:

  Dune::Functions::DiscreteScalarGlobalBasisFunction<decltype(feBasis),decltype(x)> xFunction(feBasis,x);
  auto localXFunction = localFunction(xFunction);
  SubsamplingVTKWriter<GridView> vtkWriter(gridView,2);
  vtkWriter.addVertexData(localXFunction, VTK::FieldInfo("x", VTK::FieldInfo::Type::scalar, 1));
  vtkWriter.write("poisson-pq2");

Why does the writer get a _local_ function?  Shouldn't it be able to request all the
information it needs from the DiscreteScalarGlobalBasisFunction?

Thanks,
Oliver

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