Adding new GetSIL method on vtkXdmfReader.

vtk/vtkXdmfReader.cxx

@@ -582,4 +582,8 @@ void vtkXdmfReader::PrintSelf(ostream& os, vtkIndent indent)
 {
   this->Superclass::PrintSelf(os, indent);
 }
-
+//----------------------------------------------------------------------------
+vtkGraph* vtkXdmfReader::GetSIL()
+{
+  return this->XdmfDocument->GetActiveDomain()->GetSIL();
+}

vtk/vtkXdmfReader.h

@@ -37,6 +37,7 @@
 
 class vtkXdmfArraySelection;
 class vtkXdmfDocument;
+class vtkGraph;
 
 class VTK_EXPORT vtkXdmfReader : public vtkDataReader
 {
@@ -132,6 +133,11 @@ public:
   // Every time the SIL is updated a this will return a different value.
   vtkGetMacro(SILUpdateStamp, int);
 
+  // Description:
+  // SIL describes organization of/relationships between classifications
+  // eg. blocks/materials/hierarchies.
+  virtual vtkGraph* GetSIL();
+
 //BTX
 protected:
   vtkXdmfReader();