Index: src/Common/SharpMap.Api/Editors/ISnapRule.cs
===================================================================
diff -u -r8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9 -r5fc71a385897af92ccb092f2f969b5709afab85a
--- src/Common/SharpMap.Api/Editors/ISnapRule.cs	(.../ISnapRule.cs)	(revision 8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9)
+++ src/Common/SharpMap.Api/Editors/ISnapRule.cs	(.../ISnapRule.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using GeoAPI.Extensions.Feature;
 using GeoAPI.Geometries;
@@ -8,7 +9,7 @@
     public interface ISnapRule
     {
         int PixelGravity { get; set; }
-        
+
         bool Obligatory { get; set; }
 
         /// <summary>
@@ -23,6 +24,6 @@
         /// <param name="envelope"></param>
         /// <param name="trackingIndex"></param>
         /// <returns></returns>
-        SnapResult Execute(IFeature sourceFeature, System.Tuple<IFeature, ILayer>[] snapCandidates, IGeometry snapSource, IList<IFeature> sourceGeometry, ICoordinate snapTargets, IEnvelope worldPos, int trackingIndex);
+        SnapResult Execute(IFeature sourceFeature, Tuple<IFeature, ILayer>[] snapCandidates, IGeometry snapSource, IList<IFeature> sourceGeometry, ICoordinate snapTargets, IEnvelope worldPos, int trackingIndex);
     }
 }
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