diff --git a/org.apache.lenya.core.observation/src/main/java/org/apache/lenya/cms/observation/Observer.java b/org.apache.lenya.core.observation/src/main/java/org/apache/lenya/cms/observation/Observer.java
new file mode 100644
index 0000000..d395045
--- /dev/null
+++ b/org.apache.lenya.core.observation/src/main/java/org/apache/lenya/cms/observation/Observer.java
@@ -0,0 +1,11 @@
+package org.apache.lenya.cms.observation;
+
+public class Observer {
+	String eventType; //TODO : an enum for define eventType
+	String eventFired;
+	Object observedObject;
+	
+	String observerID;
+	
+	public void event(String eventType, String eventFired,Object observedObject){}
+}