* data tree changes. This interface differs from {@link DataChangeListener}
* in that it provides a cursor-based view of the change, which has potentially
* lower overhead and allow more flexible consumption of change event.
+ *
* <p>
* Note: this interface enables notifications only at the leader of the data store, if clustered. If you want
* notifications on all instances in a cluster, use the {@link ClusteredDataTreeChangeListener}.
* to recover from such events. Event producers are expected to exert reasonable
* effort to suppress such events.
*
+ * <p>
* In other words, it is completely acceptable to observe
* a {@link DataObjectModification}, while the state observed before and
* after- data items compare as equal.