HeidelTime: High quality rule-based extraction and normalization of temporal expressions

Authors:
Jannik Strötgen;Michael Gertz
Affiliations:
University of Heidelberg, Heidelberg, Germany;University of Heidelberg, Heidelberg, Germany
Venue:
SemEval '10 Proceedings of the 5th International Workshop on Semantic Evaluation
Year:
2010

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Abstract

In this paper, we describe HeidelTime, a system for the extraction and normalization of temporal expressions. HeidelTime is a rule-based system mainly using regular expression patterns for the extraction of temporal expressions and knowledge resources as well as linguistic clues for their normalization. In the TempEval-2 challenge, HeidelTime achieved the highest F-Score (86%) for the extraction and the best results in assigning the correct value attribute, i.e., in understanding the semantics of the temporal expressions.