diff --git a/DigitalData.Core.Abstractions/IUnique.cs b/DigitalData.Core.Abstractions/IUnique.cs
new file mode 100644
index 0000000..e92ea17
--- /dev/null
+++ b/DigitalData.Core.Abstractions/IUnique.cs
@@ -0,0 +1,7 @@
+namespace DigitalData.Core.Abstractions
+{
+    public interface IUnique<T>
+    {
+        public T Id { get; }
+    }
+}
\ No newline at end of file