WS-Address Action
        action -- Action value expecting.
        value  -- Action value server returned.

def _checkAction(self, action, value):
        '''WS-Address Action
        action -- Action value expecting.
        value  -- Action value server returned.
        '''
        if action is None:
            raise WSActionException, 'Response missing WSAddress Action'
        if not value:
            raise WSActionException, 'missing WSAddress Action, expecting %s' %action
        if value != action:
            raise WSActionException, 'wrong WSAddress Action(%s), expecting %s'%(value,action)