In INNO-X subscriptions define via their dependency hierarchy which data needs to be sourced. From the source initial data and update events will then drive the computations through the same hierarchy, but in the reverse order in real-time. This means that only that data is sourced that is required and only those calculations are made that are required. And if a subscription is unsubscribed, then all subscriptions in the dependency hierarchy will be unsubscribed. This allows you to save on data fees and on your electricity bill.