diff --git a/Libraries/Esiur/Data/DataSerializer.cs b/Libraries/Esiur/Data/DataSerializer.cs
index b408dbf..92ccc66 100644
--- a/Libraries/Esiur/Data/DataSerializer.cs
+++ b/Libraries/Esiur/Data/DataSerializer.cs
@@ -41,6 +41,8 @@ public static class DataSerializer
         }
     }
 
+
+
     public static Tdu UInt32Composer(object value, Warehouse warehouse, EpConnection connection)
     {
         var v = (uint)value;
@@ -977,6 +979,11 @@ public static class DataSerializer
             (uint)rt.Count, new TruComposite(truIdentifier, false, trus, value.GetType()), connection);
 
     }
+
+    public static Tdu TypeDefComposer(object value, Warehouse warehouse, EpConnection connection)
+    {
+
+    }
 }
 
 
diff --git a/Libraries/Esiur/Data/TduIdentifier.cs b/Libraries/Esiur/Data/TduIdentifier.cs
index b7dd893..9a608a1 100644
--- a/Libraries/Esiur/Data/TduIdentifier.cs
+++ b/Libraries/Esiur/Data/TduIdentifier.cs
@@ -61,6 +61,6 @@ namespace Esiur.Data
 
         TypeContinuation = 0xC0,
         TypeOfTarget = 0xC1,
-
+        TypeDef = 0xC2,
     }
 }