diff --git a/CampusAppWP8/CampusAppDLL/Model/Campusmap/MapModel.cs b/CampusAppWP8/CampusAppDLL/Model/Campusmap/MapModel.cs
index 50edaf3c..c540c414 100644
--- a/CampusAppWP8/CampusAppDLL/Model/Campusmap/MapModel.cs
+++ b/CampusAppWP8/CampusAppDLL/Model/Campusmap/MapModel.cs
@@ -8,6 +8,7 @@
 namespace CampusAppDLL.Model.Campusmap
 {
     using CampusAppDLL.Model.GeoDb;
+    using CampusAppDLL.Utility;
     using System;
 
     /// <summary>
@@ -41,6 +42,8 @@ namespace CampusAppDLL.Model.Campusmap
         /// <remarks>Stubbfel, 19.08.2013.</remarks>
         protected virtual void LoadSpatials(string xmlFilePath)
         {
+            SpsModel model = XmlManager.DeserializationFileToModel<SpsModel>(xmlFilePath);
+            this.Spatial = model;
         }
 
         #endregion
diff --git a/CampusAppWP8/CampusAppWP8/Api/GeoApi/PisApi.cs b/CampusAppWP8/CampusAppWP8/Api/GeoApi/PisApi.cs
index 958ea718..ed6af279 100644
--- a/CampusAppWP8/CampusAppWP8/Api/GeoApi/PisApi.cs
+++ b/CampusAppWP8/CampusAppWP8/Api/GeoApi/PisApi.cs
@@ -8,12 +8,12 @@
 
 namespace CampusAppWP8.Api.GeoApi
 {
-    using System.Collections.Generic;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.GeoDb;
-    using CampusAppWP8.Model.Utility;
     using CampusAppWP8.Resources;
-    using CampusAppWPortalLib8.Model.Utility;    
+    using CampusAppWPortalLib8.Model;
+    using CampusAppWPortalLib8.Model.Utility;
+    using System.Collections.Generic;    
 
     /// <summary>Pis api.</summary>
     /// <remarks>Stubbfel, 09.09.2013.</remarks>
diff --git a/CampusAppWP8/CampusAppWP8/Api/GeoApi/PssApi.cs b/CampusAppWP8/CampusAppWP8/Api/GeoApi/PssApi.cs
index 7ff2444c..a018a069 100644
--- a/CampusAppWP8/CampusAppWP8/Api/GeoApi/PssApi.cs
+++ b/CampusAppWP8/CampusAppWP8/Api/GeoApi/PssApi.cs
@@ -8,12 +8,12 @@
 
 namespace CampusAppWP8.Api.GeoApi
 {
-    using System.Collections.Generic;
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.GeoDb;
-    using CampusAppWP8.Model.Utility;
     using CampusAppWP8.Resources;
+    using CampusAppWPortalLib8.Model;
     using CampusAppWPortalLib8.Model.Utility;
+    using System.Collections.Generic;
 
     /// <summary>Pss api.</summary>
     /// <remarks>Stubbfel, 09.09.2013.</remarks>
diff --git a/CampusAppWP8/CampusAppWP8/Api/GeoApi/SpsApi.cs b/CampusAppWP8/CampusAppWP8/Api/GeoApi/SpsApi.cs
index 2a0988ef..02a90600 100644
--- a/CampusAppWP8/CampusAppWP8/Api/GeoApi/SpsApi.cs
+++ b/CampusAppWP8/CampusAppWP8/Api/GeoApi/SpsApi.cs
@@ -13,7 +13,8 @@ namespace CampusAppWP8.Api.GeoApi
     using CampusAppWP8.Model.Utility;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
-    using CampusAppWPortalLib8.Model.Utility;    
+    using CampusAppWPortalLib8.Model.Utility;
+    using CampusAppWPortalLib8.Model;    
 
     /// <summary>
     /// Class for SPSAPI
diff --git a/CampusAppWP8/CampusAppWP8/Api/Lecture/LectureApi.cs b/CampusAppWP8/CampusAppWP8/Api/Lecture/LectureApi.cs
index bf49bb08..3a13bb3d 100644
--- a/CampusAppWP8/CampusAppWP8/Api/Lecture/LectureApi.cs
+++ b/CampusAppWP8/CampusAppWP8/Api/Lecture/LectureApi.cs
@@ -10,6 +10,7 @@ namespace CampusAppWP8.Api.Lecture
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Lecture;
     using CampusAppWP8.Resources;
+    using CampusAppWPortalLib8.Model;
     
     /// <summary>
     /// Class for the feed of the Lecture
diff --git a/CampusAppWP8/CampusAppWP8/Api/Person/PersonSearchApi.cs b/CampusAppWP8/CampusAppWP8/Api/Person/PersonSearchApi.cs
index 50ab4ef2..a982fb99 100644
--- a/CampusAppWP8/CampusAppWP8/Api/Person/PersonSearchApi.cs
+++ b/CampusAppWP8/CampusAppWP8/Api/Person/PersonSearchApi.cs
@@ -11,6 +11,7 @@ namespace CampusAppWP8.Api.Person
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Person;
     using CampusAppWP8.Resources;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>Person search api.</summary>
     /// <remarks>Stubbfel, 05.09.2013.</remarks>
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
index 40733f3a..0aca15ba 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Departments/DepartmentFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.Departments
     using CampusAppWP8.Model.Departments;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
     
     /// <summary>
     /// Feed class for the department information.
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
index f132c4f2..4e98bba6 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Events/EventFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.Events
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
     using CampusAppWPortalLib8.Model.RSS;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// Event Feed.
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
index 474b74f2..3d98da26 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Exams/ExamFeed.cs
@@ -12,6 +12,7 @@ namespace CampusAppWP8.Feed.Exams
     using CampusAppWP8.Model.Exams;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
 
      /// <summary>Exam feed.</summary>
      /// <remarks>Stubbfel, 02.09.2013.</remarks>
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Link/ClubLinkFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Link/ClubLinkFeed.cs
index 98d1c57c..d48aa593 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Link/ClubLinkFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Link/ClubLinkFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.Link
     using CampusAppWP8.Model.Link;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// This Class is for ClubLinkFeeds
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Link/CommonLinkFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Link/CommonLinkFeed.cs
index dbdc8e3d..20fd7b67 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Link/CommonLinkFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Link/CommonLinkFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.Link
     using CampusAppWP8.Model.Link;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// This Class is for CommonLinkFeeds
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Mensa/MensaFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Mensa/MensaFeed.cs
index ff79851f..6f117f4a 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Mensa/MensaFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Mensa/MensaFeed.cs
@@ -11,6 +11,7 @@ namespace CampusAppWP8.Feed.Mensa
     using System.IO;
     using CampusAppWP8.Model;
     using CampusAppWPortalLib8.Model.Mensa;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// This Class is for MensaFeeds
diff --git a/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
index 89a5ae4a..2c1edf66 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/News/NewsFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.News
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
     using CampusAppWPortalLib8.Model.RSS;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// News Feed.
diff --git a/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
index b84ebc33..9ee3a87c 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/Openinghours/OpeninghoursFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.Openinghours
     using CampusAppWP8.Model.Openinghours;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
     
     /// <summary>
     /// This Class is for MesaFeeds
diff --git a/CampusAppWP8/CampusAppWP8/Feed/StudentCouncil/StudentCouncilFeed.cs b/CampusAppWP8/CampusAppWP8/Feed/StudentCouncil/StudentCouncilFeed.cs
index 91d3fe4c..abd7d900 100644
--- a/CampusAppWP8/CampusAppWP8/Feed/StudentCouncil/StudentCouncilFeed.cs
+++ b/CampusAppWP8/CampusAppWP8/Feed/StudentCouncil/StudentCouncilFeed.cs
@@ -13,6 +13,7 @@ namespace CampusAppWP8.Feed.StudentCouncil
     using CampusAppWP8.Model.StudentCouncil;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// This Class is for  StudentCouncilFeed
diff --git a/CampusAppWP8/CampusAppWP8/File/Departments/DepartmentFavoriteFile.cs b/CampusAppWP8/CampusAppWP8/File/Departments/DepartmentFavoriteFile.cs
index 7d7e3861..ea7d1511 100644
--- a/CampusAppWP8/CampusAppWP8/File/Departments/DepartmentFavoriteFile.cs
+++ b/CampusAppWP8/CampusAppWP8/File/Departments/DepartmentFavoriteFile.cs
@@ -11,6 +11,7 @@ namespace CampusAppWP8.File.Departments
     using CampusAppWP8.Model;
     using CampusAppWP8.Model.Departments;
     using CampusAppWP8.Resources;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// Feed object to handle favorite department feeds. 
diff --git a/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs b/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
index a247b587..2e7e84b0 100644
--- a/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
+++ b/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
@@ -30,7 +30,7 @@ namespace CampusAppWP8.File.Exams
         /// <param name="fileName">Filename of the file.</param>
         /// <param name="url">     URL of the document.</param>
         public ExamFile(string fileName, string url)
-            : base(ModelType.FileAndFeed, fileName, url)
+            : base(CampusAppWPortalLib8.Model.ModelType.FileAndFeed, fileName, url)
         {
             this.IsFileUpToDateOnLoad += new IsFileUpToDate(this.CheckIsFileUpToDate);
             this.IsModelUpToDateOnLoad += new IsModelUpToDate(this.CheckIsModelUpToDate);
@@ -50,7 +50,7 @@ namespace CampusAppWP8.File.Exams
         {
             if (this.storageFile == null)
             {
-                this.storageFile = await this.file.AsStorageFile();
+                this.storageFile = await ((CampusAppWP8.Utility.File)(this.file)).AsStorageFile();
             }
 
             if (this.storageFile != null)
diff --git a/CampusAppWP8/CampusAppWP8/File/Places/PlacesFile.cs b/CampusAppWP8/CampusAppWP8/File/Places/PlacesFile.cs
index 58991d42..e6d2945a 100644
--- a/CampusAppWP8/CampusAppWP8/File/Places/PlacesFile.cs
+++ b/CampusAppWP8/CampusAppWP8/File/Places/PlacesFile.cs
@@ -22,7 +22,7 @@ namespace CampusAppWP8.File.Places
         /// <summary>Initializes a new instance of the PlacesFile class.</summary>
         /// <remarks>Stubbfel, 09.09.2013.</remarks>
         public PlacesFile()
-            : base(ModelType.File, Constants.FilePlace_AllPlaces)
+            : base(CampusAppWPortalLib8.Model.ModelType.File, Constants.FilePlace_AllPlaces)
         {
             this.OnFailedFile += new OnFailed(this.FallBackLoad);
             this.IsFileUpToDateOnLoad += new IsFileUpToDate(this.CheckIsFileUpToDate);
diff --git a/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs b/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs
index a372e9d9..24a2e809 100644
--- a/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs
@@ -6,6 +6,7 @@
 // <sience>03.09.2013</sience>
 //----------------------------------------------------------------------
 
+using CampusAppWPortalLib8.Model;
 namespace CampusAppWP8.Model
 {
     /// <summary>Binary model.</summary>
@@ -41,7 +42,7 @@ namespace CampusAppWP8.Model
         /// <remarks>Stubbfel, 03.09.2013.</remarks>
         /// <param name="modelData">Information describing the model.</param>
         /// <returns>true if it succeeds, false if it fails.</returns>
-        protected override bool DeserializeModel(byte[] modelData)
+        public override bool DeserializeModel(byte[] modelData)
         {
             bool retValue = true;
 
@@ -60,7 +61,7 @@ namespace CampusAppWP8.Model
         /// <summary>Gets the serialize model.</summary>
         /// <remarks>Stubbfel, 03.09.2013.</remarks>
         /// <returns>an byte Array.</returns>
-        protected override byte[] SerializeModel()
+        public override byte[] SerializeModel()
         {
             return this.Model;
         }
diff --git a/CampusAppWP8/CampusAppWP8/Model/MainModel.cs b/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
index fb55ccf4..c87bf18c 100644
--- a/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
@@ -8,7 +8,9 @@
 namespace CampusAppWP8
 {
     using CampusAppWP8.Utility;
+    using CampusAppWPortalLib8.Model;
     using CampusAppWPortalLib8.Model.Utility;
+    using CampusAppWPortalLib8.Utility;
     using System;
     using System.Collections.Generic;
     using System.IO;
@@ -18,7 +20,7 @@ namespace CampusAppWP8
     /// Base model io handling class.
     /// </summary>
     /// <typeparam name="T">model type</typeparam>
-    public abstract class MainModel<T>
+    public abstract class MainModel<T> : IMainModel<T>
     {
         #region Member
 
@@ -182,53 +184,11 @@ namespace CampusAppWP8
         /// Callback pointer, for checking if model is up to date at saving.
         /// (currently unused)
         /// </summary>
+        #pragma warning disable 0067
         public event IsModelUpToDate IsModelUpToDateOnSave = null;
 
         #endregion
 
-        #region Enum
-
-        /// <summary>
-        /// Specifies the I/O type of the model.
-        /// </summary>
-        public enum ModelType
-        {
-            /// <summary>
-            /// Invalid/unset state.
-            /// </summary>
-            INVALID = 0,
-
-            /// <summary>
-            /// File only (01).
-            /// </summary>
-            File = 1,
-
-            /// <summary>
-            /// Feed only (10).
-            /// </summary>
-            Feed = 2,
-
-            /// <summary>
-            /// File and feed (11).
-            /// </summary>
-            FileAndFeed = 3
-        }
-
-        /// <summary>Values that represent ForceType for load function.</summary>
-        public enum ForceType
-        {
-            /// <summary>An enumeration constant representing the invalid/default/unset option.</summary>
-            INVALID = 0,
-
-            /// <summary>An enumeration constant representing the force file option.</summary>
-            FORCE_FILE = 1,
-
-            /// <summary>An enumeration constant representing the force web option.</summary>
-            FORCE_WEB = 2
-        }
-
-        #endregion
-
         #region Property
 
         /// <summary>
@@ -436,22 +396,22 @@ namespace CampusAppWP8
             this.paramizedUri = null;
         }
 
-        #endregion
-
-        #region protected
-
         /// <summary>
         /// Abstract declaration of the model deserialize function.
         /// </summary>
         /// <param name="modelData">model data as byte array</param>
         /// <returns>true, is succeeded</returns>
-        protected abstract bool DeserializeModel(byte[] modelData);
+        public abstract bool DeserializeModel(byte[] modelData);
 
         /// <summary>
         /// Abstract declaration of the model serialize function. 
         /// </summary>
         /// <returns>model data as byte array</returns>
-        protected abstract byte[] SerializeModel();
+        public abstract byte[] SerializeModel();
+
+        #endregion
+
+        #region protected
 
         /// <summary>
         /// Check if the model io type is file.
diff --git a/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs b/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
index 27d6108a..83c936ad 100644
--- a/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
@@ -9,12 +9,13 @@ namespace CampusAppWP8.Model
 {    
     using System.Text;
     using CampusAppWPortalLib8.Utility;
+    using CampusAppWPortalLib8.Model;
     
     /// <summary>
     /// Xml model io handler class.
     /// </summary>
     /// <typeparam name="T">model type</typeparam>
-    public abstract class XmlModel<T> : MainModel<T>
+    public abstract class XmlModel<T> : MainModel<T>, IXmlModel
     {
         #region Constructor
 
@@ -44,19 +45,23 @@ namespace CampusAppWP8.Model
 
         #endregion
 
-        #region Method
+        #region Property
 
         /// <summary>
         /// Gets or sets for the name of the root-tag
         /// </summary>
-        protected string ValidRootName { get; set; }
+        public string ValidRootName { get; set; }
+
+        #endregion
+
+        #region Method
 
         /// <summary>
         /// Create the model from a xml byte array.
         /// </summary>
         /// <param name="modelData">model data</param>
         /// <returns>true, if succeeded</returns>
-        protected override bool DeserializeModel(byte[] modelData)
+        public override bool DeserializeModel(byte[] modelData)
         {
             bool retValue = true;
 
@@ -79,7 +84,7 @@ namespace CampusAppWP8.Model
         /// Serializes the model to a byte array.
         /// </summary>
         /// <returns>model data</returns>
-        protected override byte[] SerializeModel()
+        public override byte[] SerializeModel()
         {
             byte[] retValue = null;
 
diff --git a/CampusAppWP8/CampusAppWP8/Utility/File.cs b/CampusAppWP8/CampusAppWP8/Utility/File.cs
index d49ee632..7b816090 100644
--- a/CampusAppWP8/CampusAppWP8/Utility/File.cs
+++ b/CampusAppWP8/CampusAppWP8/Utility/File.cs
@@ -17,7 +17,7 @@ namespace CampusAppWP8.Utility
     /// <summary>
     /// File class.
     /// </summary>
-    public class File
+    public class File : AbstractFile
     {
         #region Member
 
@@ -45,15 +45,6 @@ namespace CampusAppWP8.Utility
 
         #endregion
 
-        #region Events
-
-        /// <summary>
-        /// Delegation of the write callback function prototype.
-        /// </summary>
-        public delegate void WriteCallbackFunc();
-
-        #endregion
-
         #region Method
 
         #region public
@@ -61,7 +52,7 @@ namespace CampusAppWP8.Utility
         /// <summary>Read data from file to a string.</summary>
         /// <remarks>Stubbfel, 03.09.2013.</remarks>
         /// <returns>data string.</returns>
-        public byte[] ReadFile()
+        public override byte[] ReadFile()
         {
             byte[] retValue = null;
 
@@ -78,7 +69,7 @@ namespace CampusAppWP8.Utility
         /// <param name="data">            data byte array.</param>
         /// <param name="onSavedCallback"> callback function, called after writing is done.</param>
         /// <param name="onFailedCallback">callback function, called when writing failed.</param>
-        public void WriteFile(byte[] data, WriteCallbackFunc onSavedCallback, WriteCallbackFunc onFailedCallback)
+        public override void WriteFile(byte[] data, WriteCallbackFunc onSavedCallback, WriteCallbackFunc onFailedCallback)
         {
             Thread th = new Thread(delegate() { this.WriteAsync(data, onSavedCallback, onFailedCallback); });
             th.Start();
@@ -98,7 +89,7 @@ namespace CampusAppWP8.Utility
         /// Check if a file is existing.
         /// </summary>
         /// <returns>true, if file exists, otherwise false</returns>
-        public bool Exist()
+        public override bool Exist()
         {
             return this.GetFileInfo().Exists;
         }
diff --git a/CampusAppWP8/CampusAppWP8/Utility/Utilities.cs b/CampusAppWP8/CampusAppWP8/Utility/Utilities.cs
index 7d86ac7a..d786d7a8 100644
--- a/CampusAppWP8/CampusAppWP8/Utility/Utilities.cs
+++ b/CampusAppWP8/CampusAppWP8/Utility/Utilities.cs
@@ -18,6 +18,7 @@ namespace CampusAppWP8.Utility
     using CampusAppWP8.Resources;
     using Microsoft.Phone.Net.NetworkInformation;
     using CampusAppWPortalLib8.Utility;
+    using CampusAppWPortalLib8.Model;
 
     /// <summary>
     /// Collection of utility functions.
@@ -347,15 +348,15 @@ namespace CampusAppWP8.Utility
         /// <remarks>Stubbfel, 27.08.2013.</remarks>
         /// <typeparam name="T">Generic type parameter.</typeparam>
         /// <returns>The load modus&lt; t&gt;</returns>
-        public static MainModel<T>.ForceType GetLoadModus<T>()
+        public static ForceType GetLoadModus<T>()
         {
             if (Settings.AppSetting.OnlyWifi && !Settings.AppSetting.WifiEnable)
             {
-                return MainModel<T>.ForceType.FORCE_FILE;
+                return ForceType.FORCE_FILE;
             }
             else
             {
-                return MainModel<T>.ForceType.INVALID;
+                return ForceType.INVALID;
             }
         }
 
diff --git a/CampusAppWP8/CampusAppWPortalLib8/CampusAppWPortalLib8.csproj b/CampusAppWP8/CampusAppWPortalLib8/CampusAppWPortalLib8.csproj
index 409d1953..5e82722f 100644
--- a/CampusAppWP8/CampusAppWPortalLib8/CampusAppWPortalLib8.csproj
+++ b/CampusAppWP8/CampusAppWPortalLib8/CampusAppWPortalLib8.csproj
@@ -33,14 +33,18 @@
     <WarningLevel>4</WarningLevel>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="Model\IMainModel.cs" />
+    <Compile Include="Model\ForcesTypes.cs" />
     <Compile Include="Model\Mensa\MealModel.cs" />
     <Compile Include="Model\Mensa\MenuModel.cs" />
     <Compile Include="Model\Mensa\MenuWeekModel.cs" />
+    <Compile Include="Model\ModelTypes.cs" />
     <Compile Include="Model\RSS\RSSChannelModel.cs" />
     <Compile Include="Model\RSS\RSSModel.cs" />
     <Compile Include="Model\RSS\RSSViewModel.cs" />
     <Compile Include="Model\Utility\CleanUrlParamModel.cs" />
     <Compile Include="Model\Utility\URLParamModel.cs" />
+    <Compile Include="Model\IXmlModel.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Resources\AppResources.Designer.cs">
       <DependentUpon>AppResources.resx</DependentUpon>
@@ -54,6 +58,7 @@
     </Compile>
     <Compile Include="Utility\AbstractHttpRequest.cs" />
     <Compile Include="Utility\AbstractBackgroundTasks.cs" />
+    <Compile Include="Utility\AbstractFile.cs" />
     <Compile Include="Utility\Logger.cs" />
     <Compile Include="Utility\DefaultStringManager.cs" />
     <Compile Include="Utility\XmlManager.cs" />
diff --git a/CampusAppWP8/CampusAppWPortalLib8/Model/ForcesTypes.cs b/CampusAppWP8/CampusAppWPortalLib8/Model/ForcesTypes.cs
new file mode 100644
index 00000000..5bfd2377
--- /dev/null
+++ b/CampusAppWP8/CampusAppWPortalLib8/Model/ForcesTypes.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CampusAppWPortalLib8.Model
+{
+    /// <summary>Values that represent ForceType for load function.</summary>
+    public enum ForceType
+    {
+        /// <summary>An enumeration constant representing the invalid/default/unset option.</summary>
+        INVALID = 0,
+
+        /// <summary>An enumeration constant representing the force file option.</summary>
+        FORCE_FILE = 1,
+
+        /// <summary>An enumeration constant representing the force web option.</summary>
+        FORCE_WEB = 2
+    }
+}
diff --git a/CampusAppWP8/CampusAppWPortalLib8/Model/IMainModel.cs b/CampusAppWP8/CampusAppWPortalLib8/Model/IMainModel.cs
new file mode 100644
index 00000000..154af71c
--- /dev/null
+++ b/CampusAppWP8/CampusAppWPortalLib8/Model/IMainModel.cs
@@ -0,0 +1,48 @@
+//-----------------------------------------------------------------------------
+// <copyright file="IMainModel.cs" company="BTU/IIT">
+//     Company copyright tag.
+// </copyright>
+// <author>fiedlchr</author>
+// <sience>05.07.2013</sience>
+//-----------------------------------------------------------------------------
+using CampusAppWPortalLib8.Model;
+namespace CampusAppWPortalLib8.Utility
+{
+    /// <summary>
+    /// Base model io handling class.
+    /// </summary>
+    /// <typeparam name="T">model type</typeparam>
+    public interface IMainModel<T>
+    {
+        /// <summary>
+        /// Gets or sets the Model.
+        /// </summary>
+        T Model { get; set; }
+
+        /// <summary>
+        /// Load the data if necessary, from web or from file, regarding if
+        /// the file data is up to date.
+        /// </summary>
+        /// <param name="force">if set/not invalid/not default, force to load from web or file</param>
+        void LoadData(ForceType force = ForceType.INVALID);
+
+        /// <summary>
+        /// Save the model data if necessary.
+        /// </summary>
+        /// <param name="force">force saving. DEFAULT: false</param>
+        void SaveData(bool force = false);
+
+        /// <summary>
+        /// Abstract declaration of the model deserialize function.
+        /// </summary>
+        /// <param name="modelData">model data as byte array</param>
+        /// <returns>true, is succeeded</returns>
+        bool DeserializeModel(byte[] modelData);
+
+        /// <summary>
+        /// Abstract declaration of the model serialize function. 
+        /// </summary>
+        /// <returns>model data as byte array</returns>
+        byte[] SerializeModel();
+    }
+}
\ No newline at end of file
diff --git a/CampusAppWP8/CampusAppWPortalLib8/Model/IXmlModel.cs b/CampusAppWP8/CampusAppWPortalLib8/Model/IXmlModel.cs
new file mode 100644
index 00000000..2543b356
--- /dev/null
+++ b/CampusAppWP8/CampusAppWPortalLib8/Model/IXmlModel.cs
@@ -0,0 +1,27 @@
+//-----------------------------------------------------------------------------
+// <copyright file="IXmlModel.cs" company="BTU/IIT">
+//     Company copyright tag.
+// </copyright>
+// <author>fiedlchr</author>
+// <sience>05.07.2013</sience>
+//-----------------------------------------------------------------------------
+namespace CampusAppWPortalLib8.Model
+{
+    using CampusAppWPortalLib8.Utility;
+    
+    /// <summary>
+    /// Xml model io handler class.
+    /// </summary>
+    /// <typeparam name="T">model type</typeparam>
+    public interface IXmlModel
+    {
+        #region Property
+
+        /// <summary>
+        /// Gets or sets for the name of the root-tag
+        /// </summary>
+        string ValidRootName { get; set; }
+
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/CampusAppWP8/CampusAppWPortalLib8/Model/ModelTypes.cs b/CampusAppWP8/CampusAppWPortalLib8/Model/ModelTypes.cs
new file mode 100644
index 00000000..9964b4e3
--- /dev/null
+++ b/CampusAppWP8/CampusAppWPortalLib8/Model/ModelTypes.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CampusAppWPortalLib8.Model
+{
+    /// <summary>
+    /// Specifies the I/O type of the model.
+    /// </summary>
+    public enum ModelType
+    {
+        /// <summary>
+        /// Invalid/unset state.
+        /// </summary>
+        INVALID = 0,
+
+        /// <summary>
+        /// File only (01).
+        /// </summary>
+        File = 1,
+
+        /// <summary>
+        /// Feed only (10).
+        /// </summary>
+        Feed = 2,
+
+        /// <summary>
+        /// File and feed (11).
+        /// </summary>
+        FileAndFeed = 3
+    }
+}
diff --git a/CampusAppWP8/CampusAppWPortalLib8/Utility/AbstractFile.cs b/CampusAppWP8/CampusAppWPortalLib8/Utility/AbstractFile.cs
new file mode 100644
index 00000000..0724f50e
--- /dev/null
+++ b/CampusAppWP8/CampusAppWPortalLib8/Utility/AbstractFile.cs
@@ -0,0 +1,52 @@
+//-----------------------------------------------------------------------------
+// <copyright file="AbstractFile.cs" company="BTU/IIT">
+//     Company copyright tag.
+// </copyright>
+// <author>fiedlchr</author>
+// <sience>03.05.2013</sience>
+//-----------------------------------------------------------------------------
+namespace CampusAppWPortalLib8.Utility
+{
+    /// <summary>
+    /// File class.
+    /// </summary>
+    public abstract class AbstractFile
+    {
+        #region Events
+
+        /// <summary>
+        /// Delegation of the write callback function prototype.
+        /// </summary>
+        public delegate void WriteCallbackFunc();
+
+        #endregion
+
+        #region Method
+
+        #region public
+
+        /// <summary>Read data from file to a string.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <returns>data string.</returns>
+         public abstract byte[] ReadFile();
+
+        /// <summary>Write bytes to the file.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="data">            data byte array.</param>
+        /// <param name="onSavedCallback"> callback function, called after writing is done.</param>
+        /// <param name="onFailedCallback">callback function, called when writing failed.</param>
+        public abstract void WriteFile(byte[] data, WriteCallbackFunc onSavedCallback, WriteCallbackFunc onFailedCallback);
+
+        /// <summary>
+        /// Check if a file is existing.
+        /// </summary>
+        /// <returns>true, if file exists, otherwise false</returns>
+        public abstract bool Exist();
+
+
+        #endregion
+
+
+        #endregion
+    }
+}
\ No newline at end of file