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- W2013710386 abstract "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〉, wherer∈ R andz∈ Z using the natural order. Each realrdetermines a macro-instant, and each pair 〈r, z〉 defines a micro-instant. The set of macro-instants forms a dense order, thereby allowing different relations to be valid at different moments, with independent rates of evolution. The micro-instants ensure that all intervals are closed, thereby simplifying the semantics.At the same time, it becomes possible to define a discrete memory operator. TheNSTLlanguage is an extension of DATALOGin which the fact base is augmented with interval time-stamps and in which rules are an extension of generalized Horn clauses that allow a memory operator ”;“ and allow time-stamped atoms in the body. TheNSTRAlanguage is a pointwise extension of the relational algebra over the time line. To do this, three temporal operators are added to the relational algebra." @default.
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- W2013710386 date "1996-11-01" @default.
- W2013710386 modified "2023-09-30" @default.
- W2013710386 title "A Non-standard Temporal Deductive Database System" @default.
- W2013710386 doi "https://doi.org/10.1006/jsco.1996.0070" @default.
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