Part 1. Theory
Time is the heart of the matter. Chapter 2 discusses two interpretations of points in time, one treating them as instants that have no temporal extent, and the other treating them as moments that do have a temporal extent. It introduces the concepts of both physical and logical clock ticks, and explains the connection between them. It explains why the distinction between moments and instants is moot as far as the representation of time in databases is concerned. It introduces the four conventions for representing time periods by means of their start and end times. This chapter also discusses the various terminologies used to talk about bitemporal time, in particular the terminology used by the computer science community, the terminology ...
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