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Portuguese Temporal Expressions Recognition: from TE characterization to an effective TER module implementation

Caroline Hagege, Jorge Baptista, Nuno Mamede
Taking into account the temporal dimension conveyed in texts is a challenge to natural language processing. At the same time this task is of great importance for a wide range of natural language processing applications. The goal of this paper is twofold. First a characterization of Portuguese temporal expressions as they appear in texts is presented. This classification is intended to meet the requirements of high inter-agreement between annotators of temporal expressions. Second, relying on this characterization, an effective temporal expression annotation tool is described. Results from its evaluation are reported.

Resumo. A dimens?ao temporal ´e um elemento estruturante fundamental para a informac¸ ?ao veiculada em textos e constitui um desafio para o processamento de l´ıngua natural, sendo igualmente importante para muitas aplicac¸ ?oes do processamento das l´ınguas. Este artigo apresenta uma classificac¸ ?ao das express?oes temporais do portugu?es que permite esclarecer algumas incertezas relativas ao estatuto das diferentes express?oes temporais e constitui uma base para a anotac¸ ?ao intersubjectiva destas express?oes. Utilizando esta classificac¸ ?ao, foi desenvolvida uma ferramenta de anotac¸ ?ao autom´atica das express?oes temporais do portugu?es, cujo desempenho foi avaliado.
STIL 2009 (Symposium in Information and Human Language Technology), São Carlos, Brazil, 8-11 September 2009