Currently there are two methods - isAfter, isBefore methods both returning Set<String>. These are used for plugin ordering. But, there are problems: 1) plugins are ordered based on category and then ordered by isAfter/isBefore within the category! 2) Plugins must know each-other by name to use this isAfter/isBefore method overrides [in addition to being plugins of same category]. We need some other solution for ordering (if at all!). For now, it is better to remove isAfter/isBefore to avoid API pollution. None of the internal plugins use that. There is only a specific test class that uses these to exercise the API!