  Memento aggregators enable users to query multiple web archives for captures
of a URI in time through a single HTTP endpoint. While this one-to-many access
point is useful for researchers and end-users, aggregators are in a position to
provide additional functionality to end-users beyond black box style
aggregation. This paper identifies the state-of-the-art of Memento aggregation,
abstracts its processes, highlights shortcomings, and offers systematic
enhancements.
