def notifyBefore(ob, action):
    """ Notification of a workflow action before it happens.

        o 'ob' is the target object of the action.

        o 'action' is a string identifying the impending action;
          usually it corresponds to a method name.

        o This workflow may veto by raising WorkflowException.

        o Unless some workflow raises WorkflowException is thrown,
          the workflow tool will emit either 'notifySuccess' or
          'notifyException' after the action.

        o Invoked by the portal_workflow tool.

        o Permission:  Private (Python only)
        """
