Interpretation and Normalization of Temporal Expressions for Question Answering

  • Sven Hartrumpf
  • Johannes Leveling
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4730)

Abstract

The German question answering (QA) system InSicht participated in QA@CLEF for the third time. InSicht implements a deep QA approach: it builds on full sentence parses, inferences on semantic representations, and matching semantic representations derived from questions and documents. InSicht was improved for QA@CLEF 2006 as follows: temporal expressions are normalized and temporal deictic expressions are resolved to explicit date representations; the coreference module was extended by a fallback strategy for increased robustness; equivalence rules can introduce negated relations; answer candidates are clustered in order to avoid multiple occurrences of one real-world entity in the answers to a list question; and finally a shallow QA subsystem that produces a second answer stream was integrated into InSicht. The current system is evaluated in an ablation study on the German questions from QA@CLEF 2006.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Sven Hartrumpf
    • 1
  • Johannes Leveling
    • 1
  1. 1.Intelligent Information and Communication Systems (IICS), University of Hagen (FernUniversität in Hagen), 58084 HagenGermany

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