Information extraction (IE) maps a language stream into database records that capture part of its meaning. Name, entity, and relation extraction are common subtasks, and an event extraction subtask has also been proposed. Various specific target sets have been defined, with results compared in government-sponsored evaluations, but defining 'meaning' for a broad spectrum of applications remains a challenge. Researchers are exploring a wide variety of learning techniques for these tasks. Initial tests have also been performed measuring IE performance on speech recognition output, but current work has only scratched the surface of this important area.
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