In this article, we discuss how temporal aspects of information systems can be modeled and implemented. We introduce extensions of an entity-relationship model which allow us to model temporal aspects. Moreover, we describe how these extended entity-relationship models are used to generate an application database which supports objects with temporarily restricted validity. We support historical objects (i.e. objects which are not valid any longer) and future objects (i.e. objects which will be valid in the future). Our approach is driven by requirements from a real-world project. In this project we had to support temporal aspects of objects in an information system supporting business processes from the area of housing construction and administration.
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