IER1 - Service consumers create and manage subscriptions.
The selection criteria within the subscription specify what updates should be notified. The selection criteria include:
metadata on data set and data set series, e.g., selection on locations such as an FIR, selection on data set types, selection on a given data set series;
kind of events in data set store (such as new data set or update to a data set series).
IER2 - Service consumers receive notification messages when the selection criteria in the subscription is met. The message describes the update that occurred in the data set store.