Added convenience methods for to/from xml and json
diff --git a/src/ProtocolBuffers.Test/CompatTests/XmlCompatibilityTests.cs b/src/ProtocolBuffers.Test/CompatTests/XmlCompatibilityTests.cs
index 14616b7..b7cfca6 100644
--- a/src/ProtocolBuffers.Test/CompatTests/XmlCompatibilityTests.cs
+++ b/src/ProtocolBuffers.Test/CompatTests/XmlCompatibilityTests.cs
@@ -1,5 +1,6 @@
 using System.IO;

 using Google.ProtocolBuffers.Serialization;

+using Google.ProtocolBuffers.TestProtos;

 using NUnit.Framework;

 

 namespace Google.ProtocolBuffers.CompatTests