AAAI Publications, Sixteenth International Conference on Principles of Knowledge Representation and Reasoning

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The Window Validity Problem in Rule-Based Stream Reasoning
Alessandro Ronca, Mark Kaminski, Bernardo Cuenca Grau, Ian Horrocks

Last modified: 2018-09-24

Abstract


Rule-based temporal query languages provide the expressive power and flexibility required to capture in a natural way complex analysis tasks over streaming data. Stream processing applications, however, typically require near real-time response using limited resources. In particular, it becomes essential that the underpinning query language has favourable computational properties and that stream processing algorithms are able to keep only a small number of previously received facts in memory at any point in time without sacrificing correctness. In this paper, we propose a recursive fragment of temporal Datalog with tractable data complexity and study the properties of a generic stream reasoning algorithm for this fragment. We focus on the window validity problem as a way to minimise the number of time points for which the stream reasoning algorithm needs to keep data in memory at any point in time.

Keywords


stream reasoning; window; Datalog; rule-based; query answering; query containment; stream processing; temporal reasoning

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