Added constants for Application (section aliases), System (node IDs) and MediaType aliases.

src/Umbraco.Core/Constants-Applications.cs

@@ -0,0 +1,46 @@
+namespace Umbraco.Core
+{
+	public static partial class Constants
+	{
+		/// <summary>
+		/// Defines the alias identifiers for Umbraco's core application sections.
+		/// </summary>
+		public static class Applications
+		{
+			/// <summary>
+			/// Application alias for the content section.
+			/// </summary>
+			public const string Content = "content";
+
+			/// <summary>
+			/// Application alias for the developer section.
+			/// </summary>
+			public const string Developer = "developer";
+
+			/// <summary>
+			/// Application alias for the media section.
+			/// </summary>
+			public const string Media = "media";
+
+			/// <summary>
+			/// Application alias for the members section.
+			/// </summary>
+			public const string Members = "member";
+
+			/// <summary>
+			/// Application alias for the settings section.
+			/// </summary>
+			public const string Settings = "settings";
+
+			/// <summary>
+			/// Application alias for the translation section.
+			/// </summary>
+			public const string Translation = "translation";
+
+			/// <summary>
+			/// Application alias for the users section.
+			/// </summary>
+			public const string Users = "users";
+		}
+	}
+}

src/Umbraco.Core/Constants-Conventions.cs

@@ -69,6 +69,27 @@
 				public const string Extension = "umbracoExtension";
 			}
 
+			/// <summary>
+			/// Defines the alias identifiers for Umbraco media types.
+			/// </summary>
+			public static class MediaTypes
+			{
+				/// <summary>
+				/// MediaType alias for a file.
+				/// </summary>
+				public const string File = "File";
+
+				/// <summary>
+				/// MediaType alias for a folder.
+				/// </summary>
+				public const string Folder = "Folder";
+
+				/// <summary>
+				/// MediaType alias for an image.
+				/// </summary>
+				public const string Image = "Image";
+			}
+
 			/// <summary>
 			/// Constants for Umbraco URLs/Querystrings.
 			/// </summary>

src/Umbraco.Core/Constants-ObjectTypes.cs

@@ -17,6 +17,11 @@
 			/// </summary>
 			public const string ContentItemType = "7A333C54-6F43-40A4-86A2-18688DC7E532";
 
+			/// <summary>
+			/// Guid for the Content Recycle Bin.
+			/// </summary>
+			public const string ContentRecycleBin = "01BB7FF2-24DC-4C0C-95A2-C24EF72BBAC8";
+
 			/// <summary>
 			/// Guid for a DataType object.
 			/// </summary>
@@ -37,6 +42,11 @@
 			/// </summary>
 			public const string Media = "B796F64C-1F99-4FFB-B886-4BF4BC011A9C";
 
+			/// <summary>
+			/// Guid for the Media Recycle Bin.
+			/// </summary>
+			public const string MediaRecycleBin = "CF3D8E34-1C1C-41e9-AE56-878B57B32113";
+
 			/// <summary>
 			/// Guid for a Media Type object.
 			/// </summary>
@@ -57,11 +67,6 @@
 			/// </summary>
 			public const string MemberType = "9B5416FB-E72F-45A9-A07B-5A9A2709CE43";
 
-			/// <summary>
-			/// Guid for the Recycle Bin.
-			/// </summary>
-			public const string RecycleBin = "01BB7FF2-24DC-4C0C-95A2-C24EF72BBAC8";
-
 			/// <summary>
 			/// Guid for a Stylesheet object.
 			/// </summary>

src/Umbraco.Core/Constants-System.cs

@@ -0,0 +1,26 @@
+namespace Umbraco.Core
+{
+	public static partial class Constants
+	{
+		/// <summary>
+		/// Defines the identifiers for Umbraco system nodes.
+		/// </summary>
+		public static class System
+		{
+			/// <summary>
+			/// The integer identifier for global system root node.
+			/// </summary>
+			public const int Root = -1;
+
+			/// <summary>
+			/// The integer identifier for content's recycle bin.
+			/// </summary>
+			public const int RecycleBinContent = -20;
+
+			/// <summary>
+			/// The integer identifier for media's recycle bin.
+			/// </summary>
+			public const int RecycleBinMedia = -21;
+		}
+	}
+}

src/Umbraco.Core/Constants.cs

@@ -1,5 +1,8 @@
 namespace Umbraco.Core
 {
+	/// <summary>
+	/// Constants all the identifiers within the Umbraco core.
+	/// </summary>
 	public static partial class Constants
 	{
 		// generic constants can go here

src/Umbraco.Core/Umbraco.Core.csproj

@@ -741,13 +741,19 @@
     <Compile Include="TypeHelper.cs" />
     <Compile Include="UmbracoApplicationBase.cs" />
     <Compile Include="Constants.cs" />
+    <Compile Include="Constants-Applications.cs">
+      <DependentUpon>Constants.cs</DependentUpon>
+    </Compile>
+    <Compile Include="Constants-Conventions.cs">
+      <DependentUpon>Constants.cs</DependentUpon>
+    </Compile>
     <Compile Include="Constants-PropertyEditors.cs">
       <DependentUpon>Constants.cs</DependentUpon>
     </Compile>
     <Compile Include="Constants-ObjectTypes.cs">
       <DependentUpon>Constants.cs</DependentUpon>
     </Compile>
-    <Compile Include="Constants-Conventions.cs">
+    <Compile Include="Constants-System.cs">
       <DependentUpon>Constants.cs</DependentUpon>
     </Compile>
     <Compile Include="UpgradeableReadLock.cs" />