WP5 Time and Streams Ralf Mller, TUHH November 7th, 2012 . How: - - PowerPoint PPT Presentation

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WP5 Time and Streams

Ralf Möller, TUHH November 7th, 2012

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WP5: Time and Streams

What: Handling of temporal aspects in Optique . Ontology-based temporal queries . Ontology-based queries over streams of data (continuous queries) How: . Extended multi-query rewriting

. Rewriting rules for temporal operators . Common subexpression detection . Dataflow setup for subexpressions on streams

. Event detection (e.g., deviations from predicted behavior) . Machine learning for determining best query plans by data and query log analysis Who: TUHH, UOXF.BL, UoA

The Optique Project 2 / 5

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WP5: Objectives

. Semantics for a suffiiently expressive temporal query language (e.g., transaction vs. valid time) . Sound and complete ontology-based query rewriting techniques

. for temporal query answering and . stream-based answering of multiple continuous queries

. Selective and controlled materialization of events and common subexpressions to optimize data flow of intermediate results

The Optique Project 3 / 5

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WP5: Tasks

T5.1: Semantics for rewritable temporal and stream-based queries (Lead UOXF.BL) T5.2: Development of OBDA rewriting techniques for temporal queries (Lead TUHH) T5.3: Development of OBDA rewriting techniques for continuous queries (Lead TUHH) T5.4: Data mining and query log analysis for improving temporal and continuous query answering (Lead UoA)

The Optique Project 4 / 5

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WP5: Deliverables

D5.1: A semantics for temporal and stream-based query answering in an OBDA context R(PU): M18 D5.2: OBDA with temporal and stream-oriented queries: Optimization techniques R(PU): M24 D5.3: Data mining and query log analysis for scalable temporal and continuous query answering R(PU): M36 D5.4: Optimizations for temporal and continuous query answering and their quantitative evaluation R(PU): M48

The Optique Project 5 / 5