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Korean TimeBank Including Relative Temporal Information

Since most documents have temporal information that can be a basis for understanding the context, the importance of temporal information extraction researches is steadily growing. Although various attempts have been made to extract temporal information from researchers internationally, it is difficult to apply them to other languages because they are usually targeted at specific languages such as English. Several annotation languages and datasets had been proposed for the studies of temporal information extraction on Korean documents, however, the representation of relative temporal information is not enough to maintain it explicitly. In this paper, we propose a concept of relative temporal information and supplement a Korean annotation language to represent new relative expressions, and extend an annotated dataset, Korean TimeBank, through the revised language. We expect that it is possible to utilize potential features from the Korean corpus by clearly annotating relative temporal relationships and to use well-refined Korean TimeBank in future studies.