protected void addStageForm(Map<String, List<String>> data) {
        stagesData.put(stage, data);
    }
Returns true if the specified action is valid in the current stage. The action should have
previously been offered to the user.

@param actionName the name of the action to validate.
@return true if the specified action is valid in the current stage.
xmppserver/src/main/java/org/jivesoftware/openfire/commands/SessionData.java