diff --git a/CSharp/Libraries/UniversalEditor.Core/Association.cs b/CSharp/Libraries/UniversalEditor.Core/Association.cs
new file mode 100644
index 00000000..d0d3e040
--- /dev/null
+++ b/CSharp/Libraries/UniversalEditor.Core/Association.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace UniversalEditor
+{
+	/// <summary>
+	/// Associates <see cref="ObjectModel" />s, <see cref="DataFormat" />s, and other related Universal Editor objects.
+	/// </summary>
+	public class Association
+	{
+		public class AssociationCollection
+			: System.Collections.ObjectModel.Collection<Association>
+		{
+
+		}
+
+		private string mvarTitle = String.Empty;
+		/// <summary>
+		/// The title of this <see cref="Association" />; for example, "JPEG images".
+		/// </summary>
+		public string Title { get { return mvarTitle; } set { mvarTitle = value; } }
+
+		private DataFormatFilter.DataFormatFilterCollection mvarFilters = new DataFormatFilter.DataFormatFilterCollection();
+		/// <summary>
+		/// The filters that are used to determine which documents can be handled by this <see cref="Association" />.
+		/// </summary>
+		public DataFormatFilter.DataFormatFilterCollection Filters { get { return mvarFilters; } }
+
+		private string mvarExternalCommandLine = String.Empty;
+		/// <summary>
+		/// The command line of an external application to launch when a file handled by this association is opened.
+		/// </summary>
+		public string ExternalCommandLine { get { return mvarExternalCommandLine; } set { mvarExternalCommandLine = value; } }
+
+		private ObjectModelReference.ObjectModelReferenceCollection mvarObjectModels = new ObjectModelReference.ObjectModelReferenceCollection();
+		/// <summary>
+		/// The <see cref="ObjectModelReference" />s which refer to <see cref="ObjectModel" />s that are included in this <see cref="Association" />.
+		/// </summary>
+		public ObjectModelReference.ObjectModelReferenceCollection ObjectModels { get { return mvarObjectModels; } }
+
+		private DataFormatReference.DataFormatReferenceCollection mvarDataFormats = new DataFormatReference.DataFormatReferenceCollection();
+		/// <summary>
+		/// The <see cref="DataFormatReference" />s which refer to <see cref="DataFormat" />s that are included in this <see cref="Association" />.
+		/// </summary>
+		public DataFormatReference.DataFormatReferenceCollection DataFormats { get { return mvarDataFormats; } }
+	}
+}
diff --git a/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj b/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
index 933d892d..94f4e009 100644
--- a/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
+++ b/CSharp/Libraries/UniversalEditor.Core/UniversalEditor.Core.csproj
@@ -46,6 +46,7 @@
     <Compile Include="Accessors\MemoryAccessor.cs" />
     <Compile Include="Accessors\StreamAccessor.cs" />
     <Compile Include="Accessors\StringAccessor.cs" />
+    <Compile Include="Association.cs" />
     <Compile Include="Checksum\ChecksumModule.cs" />
     <Compile Include="Checksum\Modules\Adler32\Adler32ChecksumModule.cs" />
     <Compile Include="Checksum\Modules\CRC32\CRC32ChecksumModule.cs" />
diff --git a/CSharp/Plugins/UniversalEditor.Essential/ObjectModels/UEPackage/UEPackageObjectModel.cs b/CSharp/Plugins/UniversalEditor.Essential/ObjectModels/UEPackage/UEPackageObjectModel.cs
index 16c4e05b..f252d419 100644
--- a/CSharp/Plugins/UniversalEditor.Essential/ObjectModels/UEPackage/UEPackageObjectModel.cs
+++ b/CSharp/Plugins/UniversalEditor.Essential/ObjectModels/UEPackage/UEPackageObjectModel.cs
@@ -19,6 +19,12 @@ namespace UniversalEditor.ObjectModels.UEPackage
 			return _omr;
 		}
 
+		private Association.AssociationCollection mvarAssociations = new Association.AssociationCollection();
+		/// <summary>
+		/// The <see cref="Association" />s provided by this package.
+		/// </summary>
+		public Association.AssociationCollection Associations { get { return mvarAssociations; } }
+
 		private ObjectModelReference.ObjectModelReferenceCollection mvarObjectModels = new ObjectModelReference.ObjectModelReferenceCollection();
 		/// <summary>
 		/// The <see cref="ObjectModel" />s provided by this package.