A Semantically Compositional Annotation Scheme for Time Normalization

We present a new annotation scheme for normalizing time expressions, such as {``}three days ago{''}, to computer-readable forms, such as 2016-03-07. The annotation scheme addresses several weaknesses of the existing TimeML standard, allowing the representation of time expressions that align to more than one calendar unit (e.g., {``}the past three summers{''}), that are defined relative to events (e.g., {``}three weeks postoperative{''}), and that are unions or intersections of smaller time expressions (e.g., {``}Tuesdays and Thursdays{''})... (read more)

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