--- trunk/libxmltv/Core/XMLTV_CONSTANTS.cs	2013/03/07 11:11:20	24
+++ trunk/libxmltv/Core/XMLTV_CONSTANTS.cs	2013/03/07 11:36:00	25
@@ -5,11 +5,21 @@ using System.Text;
 
 namespace libxmltv.Core
 {
-    public class XMLTV_CONSTANTS
+    public static class XMLTV_CONSTANTS
     {
         public const string ROOT_ELEMENT = "tv";
         public const string CHANNEL_ELEMENT = "channel";
         public const string PROGRAM_ELEMENT = "programme";
+
+        #region Source Constants
+        public static class Source
+        {
+            public const string SourceName = "source-info-name";
+            public const string GeneratorName = "generator-info-name";
+            public const string GeneratorUrl = "generator-info-url";
+        }
+        #endregion
     }
 }
 
+