[dune-fem] LagrangeDiscontinuousGalerkinSpace points

[Agnese, Marco]

Hi everybody, 
I have a very quick question. 
Using Dune::Fem::LagrangeDiscreteFunctionSpace it is possible to extract the degrees of freedom of the local function using the method lagrangePointSet().
Instead, using Dune::Fem::LagrangeDiscontinuousGalerkinSpace this is not possible. Why? How can I obtain these points?

Thank you in advance,
cheers,
Marco.