diff --git a/app/MindWork AI Studio/Settings/DataModel/DataSourceERI.cs b/app/MindWork AI Studio/Settings/DataModel/DataSourceERI.cs
new file mode 100644
index 00000000..6bc76641
--- /dev/null
+++ b/app/MindWork AI Studio/Settings/DataModel/DataSourceERI.cs	
@@ -0,0 +1,33 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// An external data source, accessed via an ERI server, cf. https://github.com/MindWorkAI/ERI.
+/// </summary>
+public readonly record struct DataSourceERI : IDataSource
+{
+    public DataSourceERI()
+    {
+    }
+    
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The hostname of the ERI server.
+    /// </summary>
+    public string Hostname { get; init; } = string.Empty;
+    
+    /// <summary>
+    /// The port of the ERI server.
+    /// </summary>
+    public int Port { get; init; }
+}
\ No newline at end of file
diff --git a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs
new file mode 100644
index 00000000..0f9b2fde
--- /dev/null
+++ b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs	
@@ -0,0 +1,28 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// Represents a local directory as a data source.
+/// </summary>
+public readonly record struct DataSourceLocalDirectory : IDataSource
+{
+    public DataSourceLocalDirectory()
+    {
+    }
+
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The path to the directory.
+    /// </summary>
+    public string Path { get; init; } = string.Empty;
+}
\ No newline at end of file
diff --git a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs
new file mode 100644
index 00000000..7c70c76b
--- /dev/null
+++ b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs	
@@ -0,0 +1,28 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// Represents one local file as a data source.
+/// </summary>
+public readonly record struct DataSourceLocalFile : IDataSource
+{
+    public DataSourceLocalFile()
+    {
+    }
+
+    /// <inheritdoc />
+    public uint Num { get; init; }
+
+    /// <inheritdoc />
+    public string Id { get; init; } = Guid.Empty.ToString();
+    
+    /// <inheritdoc />
+    public string Name { get; init; } = string.Empty;
+    
+    /// <inheritdoc />
+    public DataSourceType Type { get; init; } = DataSourceType.NONE;
+    
+    /// <summary>
+    /// The path to the file.
+    /// </summary>
+    public string FilePath { get; init; } = string.Empty;
+}
\ No newline at end of file
diff --git a/app/MindWork AI Studio/Settings/IDataSource.cs b/app/MindWork AI Studio/Settings/IDataSource.cs
new file mode 100644
index 00000000..7bd59bf0
--- /dev/null
+++ b/app/MindWork AI Studio/Settings/IDataSource.cs	
@@ -0,0 +1,29 @@
+using AIStudio.Settings.DataModel;
+
+namespace AIStudio.Settings;
+
+/// <summary>
+/// The common interface for all data sources.
+/// </summary>
+public interface IDataSource
+{
+    /// <summary>
+    /// The number of the data source.
+    /// </summary>
+    public uint Num { get; init; }
+
+    /// <summary>
+    /// The unique identifier of the data source.
+    /// </summary>
+    public string Id { get; init; }
+
+    /// <summary>
+    /// The name of the data source.
+    /// </summary>
+    public string Name { get; init; }
+
+    /// <summary>
+    /// Which type of data source is this?
+    /// </summary>
+    public DataSourceType Type { get; init; }
+}
\ No newline at end of file