/** \mainpage \section introduction Introduction The %DUNE module `dune-spgrid` provides a structured, parallel grid (\ref Dune::SPGrid "SPGrid"). Though the `dune-grid` module already contains two structured grids, `SGrid` and `YaspGrid`, both lack several important features (see \ref features for details). \section features Features The following table shows a comparison of selected features between `SGrid`, `YaspGrid`, and `SPGrid`:

| SGrid | YaspGrid | SPGrid
--- | --- | --- | ---
Provides entities for codimensions | all | 0, dim | all
Can communicate on codimensions | none | 0, dim | all
supports superentity iterators for codimensions | none | none | all
Supported domains | \f$\prod [a_i,b_i]\f$ | \f$\prod [0,b_i]\f$ | \f$\prod [a_i,b_i]\f$
Supports periodicity | no | no | yes
Supports anisotropic refinement | no | no | yes
Coordinate type is a template parameter | yes | no | yes

*/