diff --git a/Solver/CMakeLists.txt b/Solver/CMakeLists.txt
index d297e54425c6abb19e7586f38ef3622c6312d419..0a4100756c2cbb7a1d0c3c78b4c3f1e18e750c24 100644
--- a/Solver/CMakeLists.txt
+++ b/Solver/CMakeLists.txt
@@ -17,6 +17,7 @@ set(SRC
   functionDerivator.cpp
   luaFunction.cpp
   functionSpace.cpp
+  filters.cpp
 )
 
 file(GLOB HDR RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.h) 
diff --git a/Solver/filters.cpp b/Solver/filters.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d48467dc84152d5b427f52ae82e3645bf22b8a7e
--- /dev/null
+++ b/Solver/filters.cpp
@@ -0,0 +1,16 @@
+//
+// Description : Filters for function space dof selection
+//
+//
+// Author:  <Eric Bechet>::<Boris Sedji>,  02/2010
+//
+// Copyright: See COPYING file that comes with this distribution
+//
+//
+
+#include "filters.h"
+
+void FilterLevelSetForLagMultSpace::SortNodes (void)
+{
+	;
+}
\ No newline at end of file
diff --git a/Solver/filters.h b/Solver/filters.h
index 8323bc06de808fc36213acc14cf2349b787a5480..9a5781143c3b0c038d58fd85b146e4390eb30ef4 100644
--- a/Solver/filters.h
+++ b/Solver/filters.h
@@ -1,5 +1,5 @@
 //
-// Description : Filtered and xFem function space definition
+// Description : Filters for function space dof selection
 //
 //
 // Author:  <Eric Bechet>::<Boris Sedji>,  02/2010
@@ -121,5 +121,34 @@ class FilterElementsCutByLevelSet
 };
 
 
+class FilterLevelSetForLagMultSpace
+{
+
+  private :
+
+		groupOfElements * _g;
+		std::pair<int,int> _LevelSetEntity;
+		std::set<int> _winner_nodes;
+    std::set<int> _all_nodes;
+		
+	private :
+		
+		void SortNodes (void) ;
+
+  public :
+
+    FilterLevelSetForLagMultSpace(std::pair<int,int> LevelSetEntity, groupOfElements * g) : _LevelSetEntity(LevelSetEntity), _g(g)
+    {
+				SortNodes();
+    }
+
+    virtual bool operator () (Dof & key) const
+    {
+				;
+    }
+
+};
+
+
 
 #endif