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2013-08-22 09:48:48 -0500 asked a question how to appened the new faces into the xml file

Hi, I am trying to do face recognition module. In this i am using Face recognizer class. By using the save option, copied the faces to the xml file. Again if i try to add some faces to the xml file, it is not getting appended, instead it again starts to add fron starting. Help me how can i appened the new faces into existing xml file using face recognizer class.