AbstractReturns the tracker:id of the element being notified upon. This is a gint64
which is used as efficient internal identifier for the resource.
the resource ID
Returns the Uniform Resource Name of the element. This is Tracker's public identifier for the resource.
This URN is an unique string identifier for the resource being
notified upon, typically of the form urn:uuid:....
The element URN
TheTrackerNotifierEvent struct represents a
change event in the stored data.