管理多个子产品和多个版本的更新有哪些策略？

We have a product that has multiple extensions that ship with it, each of which has its own version number. (Specifically we have a xulrunner application with multiple extensions). The extension manager for xulrunner provides an update functionality so that it will call a function any time the version number of that extension has increased. This gives us a hook to do any necessary clean-up with the update.We have a product that has multiple extensions