--- a/Model/DocumentInterface.php	Fri Dec 09 04:53:56 2011 +0100
+++ b/Model/DocumentInterface.php	Fri Dec 09 06:43:49 2011 +0100
@@ -70,5 +70,11 @@
      * @param $tagsStr
      */
     function setTagsStr($tagsStr);
+    
+   /**
+    * return the utc time when this object has been created
+    */
+    function getCreatedAt();
+    
             
 }