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                        You can use the Extract WSS Username Token filter to extract 
                        a WS-Security Username Token from a message if it exists. The extracted Username 
                        Token is stored in the wss.usernameToken message attribute.
                      
               
                        If you want to process the Username Token later in the policy, you can specify 
                        this message attribute in the configuration screen for the processing filter. 
                        For example, if you want to sign the Username Token, you can simply specify the 
                        wss.usernameToken message attribute in the What to 
                              Sign section of the Sign Message filter. Open the 
                        Message Attribute tab on the What to Sign 
                        screen, and specify this attribute to sign the Username Token.  
                      
               

