lockAction

                     The lockAction attribute is used to indicate what
                     a Web Feature Service should do when it encounters
                     a feature instance that has already been locked by
                     another client application.
      
                     Valid values are ALL or SOME.
      
                     ALL means that the Web Feature Service must acquire
                     locks on all the requested feature instances.  If it
                     cannot acquire those locks then the request should
                     fail.  In this instance, all locks acquired by the
                     operation should be released.
       
                     SOME means that the Web Feature Service should lock
                     as many of the requested features as it can.