A new temporal deductive database system supporting a non-standard model of time is introduced. It consists of Non-standard Temporal Datalog (nstl) and Non-standard Temporal Relational Algebra (nstra). The time line consists of non-standard reals that are of the form 〈r, z〉, where r ∈ R and z ∈ Z, using the natural order. Each real r determines a macro-instant, and each pair 〈r, z〉 defines a mi...

Both structural and behavioral aspects need to be modeled in some spatio-temporal databases. There existing initial efforts to represent behavioral aspects of the spatio-temporal applications via events gave their priority to some local or partial behaviors rather than an overview of the system’s behavior. In this paper, an event-based approach is proposed for modeling the system’s behavior of ...

In this paper we present an overview of the V2 temporal document database system, which supports storage, retrieval, and querying of temporal documents.

A database description framework is introduced that accounts for static constraints, that is, constraints on what data can be stored,as well as transition constraints, that is, constraints on how data can be updated. Two levels of specification are considered. At the first level of specification, a database description Dl does not indicate how the database will be updated. Transition constraint...

Temporal reasoning and temporal query languages present diicult research problems of theoretical interest and practical importance. One problem is the chasm between point-based temporal reasoning and interval-based reasoning. Another problem is the lack of ro-bustness and universality in many proposed solutions, whereby temporal extensions designed for one language cannot be easily applied to o...

We address a fundamental question concerning spatio-temporal database systems: “What are exactly spatio-temporal queries?” We define spatio-temporal queries to be computable mappings that are also generic, meaning that the result of a query may only depend to a limited extent on the actual internal representation of the spatio-temporal data. Genericity is defined as invariance under transformat...

A data modeling perspective on computer support for collaborative writing is given. In particular, the problem is identified as a temporal database application. The solution proposed is based upon a design system architecture the repository of which uses the GENREG historical data model. GENREG uses event graphs to provide a group memory. Nodes represent the design objects (documents, reference...

The time is generally a challenging task. All issues in relation to time can be better supported using temporal data models. Almost all enterprise database systems have implemented temporal data, partly according to the model specified in the SQL:2011 standard and partly according to other, older temporal models. In this article five temporal concepts will be used to investigate their implement...

In logic, the spatio-temporal location of a proposition is characterized precisely within a Cartesian system of space and time coordinates. This is suitable for characterizing the truth value of propositions relative to possible worlds, but not for modeling the spatio-temporal orientation of natural cognitive agents.1 This paper presents an alternative approach to representing space and time. W...

The quickly increasing number of spatio-temporal applications in fields like environmental monitoring, geology and mobile communication is a new challenge to the development of geo-databases. However, the query functionality of today ́s geo-information systems is still limited to the thematic attributes of spatial objects and to spatial 2D objects. In this paper we present two examples for the d...