Modality and Negation in Event Extraction

  title={Modality and Negation in Event Extraction},
  author={Sander Bijl de Vroe and Liane Guillou and Milo{\vs} Stanojevi{\'c} and Nick McKenna and Mark Steedman},
Language provides speakers with a rich system of modality for expressing thoughts about events, without being committed to their actual occurrence. Modality is commonly used in the political news domain, where both actual and possible courses of events are discussed. NLP systems struggle with these semantic phenomena, often incorrectly extracting events which did not happen, which can lead to issues in downstream applications. We present an open-domain, lexicon-based event extraction system… Expand

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