The relational algebra is a procedural query language for relational databases. In this paper
we survey extensions of the relational algebra that can query databases recording time …

This paper provides a systematic and comprehensive study of the underlying semantics of
temporal databases, summarizing the results of an intensive collaboration between the two …

Semiotics, the science of signs, has long been recognised as an important discipline for
understanding information and communications. Moreover it has found wide application in …

Recently, attention has been focused on temporal databases, representing an enterprise
over time. We have developed a new language, Tquel, to query a temporal database. TQuel …

Spatio-temporal databases deal with geometries changing over time. In general, geometries
cannot only change in discrete steps, but continuously, and we are talking about moving …

In a temporal database, time values are associated with data item to indicate their periods of
validity. We propose a model for temporal databases within the framework of the classical …

Following in the tradition of its popular predecessor, the Manual of Geospatial Science and
Technology, Second Edition continues to be the authoritative volume that covers all aspects …

This paper proposes an extension of the relational data model for incorporating temporal
semantics of the real world into a database. In this temporal relational model (TRM), the …

This paper investigates the development of temporal GIS and its applicability to support
spatio-temporal modeling. Many GIS data models have been proposed to incorporate …

Critical to the design of an historical database model is the representation of the “existence”
of objects across the temporal dimension—for example, the “birth,”“death,” or “rebirth” of an …